SQUARE-BROWED MALTHE AND DOUBLE FISH.
SQUARE-BROWED MALTHE AND DOUBLE FISH.
Gold Fish (of the Carp family) have been made to distinguish a particular sound made by those from whom they receive their food; they recognise their footsteps at a distance, and come at their call. Captain Brown says Gold Fish, when kept in ponds, are "frequently taught to rise to the surface of the water at the sound of a bell to be fed;" and Mr. Jesse was assured that Gold Fish evince much pleasure on being whistled to. Hakewill, in his "Apology for God's Power and Providence,"cites Pliny to show that a certain emperor had ponds containing fish, which, when called by their respectivenamesthat were bestowed upon them, came to the spot whence the voice proceeded. Bernier, in his "History of Hindustan," states a like circumstance of the fish belonging to the Great Mogul. The old poet, Martial, also mentions fish coming at the call, as will be seen by the following translation from one of his epigrams:—
"Angler! could'st thou be guiltless? Then forbear:For these are sacred fishes that swim here;Who know their Sovereign, and will lick his hand.Than which none's greater in the world's command;Nay, more; they've names, and when they called are.Do to their several owners' call repair."
"Angler! could'st thou be guiltless? Then forbear:For these are sacred fishes that swim here;Who know their Sovereign, and will lick his hand.Than which none's greater in the world's command;Nay, more; they've names, and when they called are.Do to their several owners' call repair."
"Angler! could'st thou be guiltless? Then forbear:
For these are sacred fishes that swim here;
Who know their Sovereign, and will lick his hand.
Than which none's greater in the world's command;
Nay, more; they've names, and when they called are.
Do to their several owners' call repair."
Who, after reading so many instances, can doubt that fish hear?
It has been found that the water from steam-engines, which is thrown into dams or ponds for the purpose of being cooled, conduces much to the nutriment of Gold Fish. In these dams, the average temperature of which is about eighty degrees, it is common to keep Gold Fish; in which situation they multiply much more rapidly than in ponds of lower temperature exposed to variations of the climate. Three pair of fish were put into one of these dams, where they increased so rapidly that at the end of three years their progeny, which was accidentally poisoned by verdigris mixed with the refuse tallow from the engine, were taken out by wheel-barrow-fuls. Gold Fish are by no means useless inhabitantsof these dams, as they consume the refuse grease which would otherwise impede the cooling of the water by accumulating on its surface. It is not improbable that this unusual supply of aliment may co-operate with increase of temperature in promoting the fecundity of the fishes.
Most of our readers have heard of the fish popularly known as the Miller's Thumb, the origin of the name of which Mr. Yarrell has thus explained:—"It is well known that all the science and tact of a miller is directed so to regulate the machinery of his mill that the meal produced shall be of the most valuable description that the operation of grinding will permit, when performed under the most advantageous circumstances. His ear is constantly directed to the note made by the running stone in its circular course over the bedstone, the exact parallelism of their two surfaces, indicated by a particular sound, being a matter of the first consequence; and his hand is constantly placed under the meal-spout to ascertain, by actual contact, the character and quality of the meal produced, which he does by a particular movement of his thumb in spreading the sample over his fingers. By this incessant action of the miller's thumb, a peculiarity in its shape is produced, which is said to resemble exactly the shape of theriver bull-head, a fish constantly found in the mill-stream, and which has obtained for it the name of the Miller's Thumb."
M. Coste has constructed a kind of marine observatory at Concarneau (Finisterre) for the purposeof studying the habits and instincts of various Sea-fish. A terrace has been formed on the top of a house on the quay, with reservoirs arranged like a flight of steps. The sea-water is pumped up to the topmost reservoir, and thence flows down slowly, after the manner of a rivulet. The length is divided into 95 cells by wire net partitions, which, allowing free passage to the water, yet prevent the different species of fish from mingling together. By this ingenious contrivance each kind lives separate, enjoying its peculiar food and habits, unconscious of its state of captivity. Some species, such as the Mullet, the Stickleback, &c., grow perfectly tame, will follow the hand that offers them food, and will even allow themselves to be taken out of the water. The Goby and Bull-head are less familiar. The Turbot, which looks so unintelligent, will, nevertheless, take food from the hand; it changes colour when irritated, the spots with which it is covered growing pale or dark, according to the emotions excited in it. But the most curious circumstance concerning it is, that it swallows fish of a much larger size than would appear compatible with the apparent smallness of its mouth. Thus, a young Turbot, not more than ten inches in length, has been seen to swallow Pilchards of the largest size. The Pipe-Fish has two peculiarities. These fish form groups, entwining their tails together, and remaining immoveable in a vertical position, with their heads upwards. When food is offered them, they perform a curious evolution—they turn round on their backs to receiveit. This is owing to the peculiar position of the mouth, which is placed under a kind of beak, and perpendicular to its axis.
The crustaceous tribes have also furnished much matter of observation. The Prawn and Crab, for instance, exercises the virtue of conjugal fidelity to the highest degree; for the male takes hold of his mate, and never lets her go; he swims with her, crawls about with her, and if she is forcibly taken away from him, he seizes hold of her again. The metamorphoses to which various crustaceous tribes are subject have also been studied with much attention.[16]
Much as the nature and habits of fish have been studied of late years, the economy of some is to this day involved in obscurity. The Herring is one of these fishes. The Swedish Herring Fisheries were, at one time, the largest in Europe, but at present, during the temporary disappearance of the fish, they have dwindled away. The causes which influence the movements of the Herring—one of the most capricious of fish—are a puzzle which naturalists have as yet failed to solve. They are not migratory, as was at one time believed—that is, they seldom wander far from the place where they were bred; but they are influenced by certain hidden and unexplained causes at one time to remain for years in the deep sea, and at another to come close in to land in enormous numbers. During the first half of the sixteenth century, Herrings entirely deserted theSwedish coasts. In 1556 they reappeared, and remained for thirty-one years in the shallow waters. Throughout this period they were taken in incalculable numbers; "thousands of ships came annually from Denmark, Germany, Friesland, Holland, England, and France, to purchase the fish, of which sufficient were always found for them to carry away to their own or other countries.... From the small town of Marstrand alone some two million four hundred thousand bushels were yearly exported." In 1587 the Herrings disappeared, and remained absent for seventy-three years, till 1660. In 1727 they returned, and again in 1747, remaining till 1808, and during this last period the fisheries were prosecuted with extraordinary zeal, industry, and success. The Government gave every encouragement to settlers, and it was computed that during some years as many as fifty thousand strangers took part in them. In 1808 the Herrings once more disappeared, and have never returned since. The cause must still be considered as quite unknown; but we may fairly assume, according to historical precedents, that after a certain period of absence, the Herrings will again return.[17]
Aristotle, in his "History of Animals," makes some extremely curious observations on Fish and Cetaceous Animals, as might be expected from the variety of these animals in the Grecian seas. In Spratt and Forbes's "Travels in Syria" the account of the habits and structure of the Cuttle-fish inAristotle's work is ranked amongst the most admirable natural history essays ever written. It is, moreover, remarkable for its anticipation.
Dr. Osborne, in 1840, read to the Royal Society a short analysis of this work, in which he showed that Aristotle anticipated Dr. Jenner's researches respecting the cuckoo; as also some discoveries respecting the incubated egg, which were published as new in the above year. Aristotle describes the economy of bees as we have it at present; but mistakes the sex of the queen. The various organs are described as modified throughout the different classes of animals (beginning with man) in nearly the same order as that afterwards adopted by Cuvier.
The chief value of this body of knowledge, which has been buried for above 2,000 years, is, that it is a collection of facts observed under peculiar advantages, such as never since occurred, and thatit is at the present day to be consulted for new discoveries.
According to Pliny, for the above work some thousands of men were placed at Aristotle's disposal throughout Greece and Asia, comprising persons connected with hunting and fishing, or who had the care of cattle, fish-ponds, and apiaries, in order that he might obtain information from all quarters,ne quid usquam gentium ignoretur ab eo. According to Athenæus, Aristotle received from the prince, on account of the expenses of the work, 800 talents, or upwards of 79,000l.
[14]A tench was brought to Mr. Harmer so full of spawn that the skin was burst by a slight knock, and many thousands of the eggs were lost; yet even after this misfortune he found the remainder to amount to 383,252! Of other marine animals, which he includes under the general term fish, the fecundity, though sufficiently great, is by no means enormous. A lobster yielded 7,227 eggs; a prawn 3,806; and a shrimp 3,057. See Mr. Harmer's paper, "Philosophical Transactions," 1767.[15]"Athenæum."[16]See "The Tree-climbing Crab," pp. 282-302.[17]"Saturday Review."
[14]A tench was brought to Mr. Harmer so full of spawn that the skin was burst by a slight knock, and many thousands of the eggs were lost; yet even after this misfortune he found the remainder to amount to 383,252! Of other marine animals, which he includes under the general term fish, the fecundity, though sufficiently great, is by no means enormous. A lobster yielded 7,227 eggs; a prawn 3,806; and a shrimp 3,057. See Mr. Harmer's paper, "Philosophical Transactions," 1767.
[15]"Athenæum."
[16]See "The Tree-climbing Crab," pp. 282-302.
[17]"Saturday Review."
Letter I
INthis bitterly cold country, where the snow lies deep six months out of the twelve, the natives subsist principally on fish, of which there is an extraordinary abundance generally, and of salmon particularly. Salmon swarm in such numbers that the rivers cannot hold them. In June and July every rivulet, no matter how shallow, is so crammed with salmon that, from sheer want of room, they push one another high and dry upon the pebbles; and Mr. Lord[18]tells us that each salmon, with its head up, struggles, fights, and scuffles for precedence. With one's hands only, or more easily by employing a gaff or a crook-stick, tons of salmon have been procured by the simple process of hooking them out. Once started on their journey, the salmon never turn back. As fast as those in front die, fresh arrivals crowd on to take their places,and share their fate. "It is a strange and novel sight to see three moving lines of fish—the dead and dying in the eddies and slack water along the bank, the living breasting the current in the centre, blindly pressing on to perish like their kindred." For two months this greatsalmon armyproceeds on its way up stream, furnishing a supply of food without which the Indians must perish miserably. The winters are too severe for them to venture out in search of food, even if there was any to be obtained. From being destitute of salt, they are unable to cure meat in the summer for winter provisions, and hence for six months in the year they depend upon salmon, which they preserve by drying in the sun.
But the Indian has another source of provision for the winter, fully as important as the salmon. The Candle-fish supplies him at once with light, butter, and oil.[19]When dried, and perforated with a rush, or strip of cypress-bark, it can be lighted, and burns steadily until consumed. Strung up, and hung for a time in the smoke of a wood fire, it is preserved as a fatty morsel to warm him when pinched with cold; and, by heat and pressure, it is easily converted into liquid oil, and drunk with avidity. That nothing may be wanting, the hollow stalk of the sea-wrack, which at the root is expanded into a complete flask, makes an admirable bottle; and so, when the Indian buries himself for long dreary months in his winter quarters, neither hislarder nor his cellar are empty, and he has a lamp to lighten the darkness. The steamers have, however, frightened away the Candle-fish and the Indian from their old haunts, and they have both retreated to the north of the Colombia River.
Amongst the other inhabitants of the salt and fresh waters of these regions are the Halibut and the Sturgeon, both of which attain to an immense size. The bays and inlets along the coast abound with marine wonders. There feasts and fattens the Clam, a bivalve so gigantic that no oyster-knife can force an entrance, and only when his shell is almost red-hot will he be at last constrained to open his dwelling.
And there lies in wait the awful Octopus, a monster of insatiable voracity, of untameable ferocity, and of consummate craft; of sleepless vigilance, shrouded amidst the forest of sea-weed, and from the touch of whose terrible arms no living thing escapes. It attains to an enormous size in those seas, the arms being sometimes five feet in length, and as thick at the base as a man's wrist. No bather would have a chance if he once got within the grasp of such a monster, nor could a canoe resist the strength of its pull; but the Indian, who devours the Octopus with great relish, has all the cunning created by necessity, and takes care that none of the eight sucker-dotted arms ever gain a hold on his frail bark.
Professor Owen has figured a species of Octopus, the Eight-armed Cuttle of the European seas, representingit in the act of creeping on shore, its body being carried vertically in the reverse position, with its head downwards, and its back being turned towards the spectator, upon whom it is supposed to be advancing. This animal is said to be luminous in the dark. Linnæus quotes Bartholinus for the statement that one gave so much light that when the candle was taken away, it illuminated the room.
The Sturgeon is one of the finest fishes of the country, and Mr. Lord's account of the Indian mode of taking them is a very graphic picture of this river sport.
"The spearman stands in the bow, armed with a most formidable spear. The handle, from seventy to eighty feet long, is made of white pine-wood; fitted on the spear-haft is a barbed point, in shape very much like a shuttlecock, supposing each feather represented by a piece of bone, thickly barbed, and very sharp at the end. This is so contrived that it can be easily detached from the long handle by a sharp, dexterous jerk. To this barbed contrivance a long line is made fast, which is carefully coiled away close to the spearman, like a harpoon-line in a whale-boat. The four canoes, alike equipped, are paddled into the centre of the stream, and side by side drift slowly down with the current, each spearman carefully feeling along the bottom with his spear, constant practice having taught the crafty savages to know a Sturgeon's back when the spear comes in contact with it. The spear-head touches the drowsy fish; a sharp plunge, and the redskin sends the notched points through armour and cartilage, deep into the leather-like muscles. A skilful jerk frees the long handle from the barbed end, which remains inextricably fixed in the fish; the handle is thrown aside, the line seized, and the struggle begins. The first impulse is toresist this objectionable intrusion, so the angry Sturgeon comes up to see what it all means. This curiosity is generally repaid by having a second spear sent crashing into him. He then takes a header, seeking safety in flight, and the real excitement commences. With might and main the bowman plies the paddle, and the spearman pays out the line, the canoe flying through the water. The slightest tangle, the least hitch, and over it goes; it becomes, in fact, a sheer trial of paddleversusfin. Twist and turn as the Sturgeon may, all the canoes are with him. He flings himself out of the water, dashes through it, under it, and skims along the surface; but all is in vain, the canoes and their dusky oarsmen follow all his efforts to escape, as a cat follows a mouse. Gradually the Sturgeon grows sulky and tired, obstinately floating on the surface. The savage knows he is not vanquished, but only biding a chance for revenge; so he shortens up the line, and gathers quietly on him to get another spear in. It is done,—and down viciously dives the Sturgeon; but pain and weariness begin to tell, the struggles grow weaker and weaker as life ebbs slowly away, until the mighty armour-plated monarch of the river yields himself a captive to the dusky native in his frail canoe."
There is a very rare Spoonbill Sturgeon found in the western waters of North America: its popular name is Paddle-fish. One, five feet in length, weighed forty pounds; the nose, resembling a spatula, was thirteen inches in length. It was of a light slate colour, spotted with black; belly white; skin smooth, like an eel; the flesh compact and firm, and hard when boiled—not very enticing to the epicure. The jaws are without teeth, but the fauces are lined with several tissues of the most beautiful network, evidently for the purpose of collecting its food from the water by straining, or passing itthrough these membranes in the same manner as practised by the spermaceti whale. Near the top of the head are two small holes, through which it is possible the Sturgeon may discharge water in the manner practised by cetaceous animals. It is conjectured that the long "Spoonbill" nose of this fish is for digging up or moving the soft mud in the bottom of the river, and when the water is fully saturated, draw it through the filamentory strainers in search of food.
Sturgeons resemble sharks in their general form, but their bodies are defended by bony shields, disposed in longitudinal rows; and their head is also well curiassed externally. The Sturgeons of North America are of little benefit to the natives. A few speared in the summer-time suffice for the temporary support of some Indian hordes; but none are preserved for winter use, and the roe and sounds are utterly wasted.
The northern limit of the Sturgeon in America is probably between the 55th and 56th parallels of latitude. Dr. Richardson did not meet with any account of its existence to the north of Stewart's Lake, on the west side of the Rocky Mountains; and on the east side it does not go higher than the Saskatchewan and its tributaries. It is not found in Churchill River, nor in any of the branches of the Mackenzie or other streams that fall into the Arctic Seas—a remarkable circumstance when we consider that some species swarm in the Asiatic rivers which flow into the Icy Sea. Sturgeons occur in all thegreat lakes communicating with the St. Lawrence, and also along the whole Atlantic coast of the United States down to Florida. Peculiar species inhabit the Mississippi; it is, therefore, probable that the range of the genus extends to the Gulf of Mexico.
The great rapid which forms the discharge of the Saskatchewan into Lake Winnipeg appears quite alive with these fish in the month of June; and some families of the natives resort thither at that time to spear them with a harpoon, or grapple them with a strong hook tied to a pole. Notwithstanding the great muscular power of the Sturgeon, it is timid; and Dr. Richardson saw one so frightened at the paddling of a canoe, that it ran its nose into a muddy bank, and was taken by avoyageur, who leaped upon its back.
In Colombia River, a small species of Sturgeon attains eleven feet in length, and a weight of six hundred pounds.[20]It is caught as high up as Fort Colville, notwithstanding the numerous intervening cataracts and rapids which seem to be insuperable barriers to a fish so sluggish in its movements.
The Sturgeon is styled a Royal Fish in England, because, by a statute of Edward II. it is enacted, "the King shall have Sturgeon taken in the sea, or elsewhere, within the realm."
[18]"The Naturalist in Vancouver Island and British Columbia." By John Keast Lord, F.Z.S., Naturalist to the British North American Boundary Commission.[19]The Petrel is similarly used in the Faroe Islands. (Seeante, p. 234.) It may, therefore, be called the Candle Bird.[20]Dr. Richardson. TheHurois reported by Pallas to attain a weight of nearly three thousand pounds, and a length exceeding thirty feet.
[18]"The Naturalist in Vancouver Island and British Columbia." By John Keast Lord, F.Z.S., Naturalist to the British North American Boundary Commission.
[19]The Petrel is similarly used in the Faroe Islands. (Seeante, p. 234.) It may, therefore, be called the Candle Bird.
[20]Dr. Richardson. TheHurois reported by Pallas to attain a weight of nearly three thousand pounds, and a length exceeding thirty feet.
Letter T
THEtransition from the ordinary mode of the locomotion of fishes by swimming to that of climbing has been ably illustrated by the Rev. Dr. Buckland, who showed, in a communication to the Ashmolean Society, in 1843, that the fins in certain genera perform the functions of feet and wings. Thus, "fishing-frogs" have the fins converted into feet, or paddles, by means of which they have the power of crawling or hopping on sand and mud; and another species can live three days out of the water, and walk upon dry land. The climbing perch of the Indian rivers is known to live a long time in the air, and to climb up the stems of palm-trees in pursuit of flies, by means of spinous projections on its gill-covers. Fishes of thesilurusfamily have a bony enlargement of the first ray of the pectoral fin, which is also armed with spines; and this is not only an offensive and defensive weapon, but enables the fish to walk along the bottom of the fresh waterswhich it inhabits. The flying-fishes are notorious examples of the conversion of fins into an organ of movement in the air. M. Deslongchamps has published, in the "Transactions of the Linnæan Society of Normandy," 1842, a curious account of the movements of the gurnard at the bottom of the sea. In 1839, he observed these movements in one of the artificial fishing-ponds, or fishing-traps, surrounded by nets, on the shore of Normandy. He saw a score of gurnards closing their fins against their sides, like the wing of a fly in repose, and without any movement of their tails, walking along the bottom by means of six free rays, three on each pectoral fin, which they placed successively on the ground. They moved rapidly forwards, backwards, to the right and left, groping in all directions with these rays, as if in search of small crabs. Their great heads and bodies seemed to throw hardly any weight on the slender rays, or feet, being suspended in water, and having their weight further diminished by their swimming-bladder. During these movements the gurnards resembled insects moving along the sand. When M. Deslongchamps moved in the water, the fish swam away rapidly to the extremity of the pond; when he stood still, they resumed their ambulatory movement, and came between his legs. On dissection, we find these three anterior rays of the pectoral fins to be supported each with strong muscular apparatus to direct their movements, apart from the muscles that are connected with the smaller rays of the pectoral fin.
Dr. Buckland states that Miss Potts, of Chester, had sent to him a flagstone from a coalshaft at Mostyn, bearing impressions which he supposed to be the trackway of some fish crawling along the bottom by means of the anterior rays of its pectoral fins. There were no indications of feet, but only scratches, symmetrically disposed on each side of a space that may have been covered by the body of the fish whilst making progress, by pressing its fin-bones on the bottom. As yet, no footsteps of reptiles, or of any animals more highly organized than fishes, have been found in strata older than those which belong to the new red sandstone. The abundant remains of fossil fishes, armed with strong bony spines, and of other fishes allied to the gurnard, in strata of the carboniferous and old red sandstone series, would lead us to expect the frequent occurrence of impressions made by their locomotive organs on the bottoms of the ancient waters in which they lived. Dr. Buckland proposed to designate these petrified traces or trackways of ancient fishes by the term of fish-tracks.
Crabs and Lobsters are strange creatures: strange in their configurations; strange in the transmutations which they exhibit from the egg to maturity; strange in the process they undergo of casting off, not only their shell, but the covering of their eyes, of their long horns, and even the lining of their tooth-furnished stomach; strange, also, are they in their manners and habits. Many a reader, in wandering along the sea-shore, may havedisturbed little colonies of Crabs quietly nestling in fancied security amidst banks of slimy sea-weed; and in the nooks and recesses of the coast, the shallows, and strips of land left dry at ebb-tide, may be seen numbers of little, or perchance large, Crabs, some concealed in snug lurking-places, others tripping, with a quickside-longmovement, over the beach, alarmed by the advance of an unwelcome intruder. Some are exclusively tenants of the water, have feet formed like paddles for swimming, and never venture on land; others seem to love the air and sunshine, and enjoy an excursion, not without hopes of finding an acceptable repast, over the oozy sands; some, equally fond of the shore and shallow water, appropriate to themselves the shells of periwinkles, whelks, &c., and there live in a sort of castle, which they drag about with them on their excursions, changing it for a larger as they increase in measure of growth. They vary in size from microscopic animalcules to the gigantic King Crab:[21]to the former, the luminosity of the ocean, or of the foambefore the prows of vessels, is, to a great extent, attributable, each minute creature glowing with phosphoric light.
The Bernhard Crab has been proved to have the power of dissolving shells, it not being unusual to find the long fusiform shells which are inhabited by these animals with the inner lip, and the greater part of the pillar on the inside of the mouth, destroyed, so as to render the aperture much larger than usual. Dr. Gray is quite convinced that these Crabs have the above power, some to a much greater degree than others.
Certain Crabs, especially in the West Indies, are almost exclusively terrestrial, visiting the sea only at given periods, for the deposition of their eggs. These Crabs carry in their gill-chambers sufficient water for the purpose of respiration; they live in burrows, and traverse considerable tracts of land in the performance of their migratory journeys. Of these, some, as the Violet Crab, are exquisite delicacies.
Of a great Crab migration we find these details in the "Jamaica Royal Gazette:"—In 1811 there was a very extraordinary production of Black Crabs in the eastern part of Jamaica. In June or July the whole district of Manchidneed was covered with countless numbers, swarming from the sea to the mountains. Of this the writer was an eye-witness. On ascending Over Hill from the vale of Plantain Garden River, the road appeared of a reddish colour, as if strewed with brick-dust. It was owing tomyriads of young Black Crabs, about the size of the nail of a man's finger, moving at a pretty quick pace, direct for the mountains. "I rode along the coast," says the writer, "a distance of about fifteen miles, and found it nearly the same the whole way. Returning the following day, I found the road still covered with them, the same as the day before. How have they been produced, and where do they come from? were questions everybody asked, and nobody could answer. It is well known that Crabs deposit their eggs once a year, in May; but, except on this occasion, though living on the coast, I had never seen above a dozen young Crabs together; and here were myriads. No unusual number of old Crabs had been observed in that season; and it is worthy of note, that they were moving from a rock-bound coast of inaccessible cliffs, the abode of sea-birds, and exposed to the constant influence of the trade winds. No person, as far as I know, ever saw the like, except on that occasion; and I have understood that since 1811 Black Crabs have been more abundant further in to the interior of the island than they were ever known before."
Cuvier describes the Burrowing Crab as displaying wonderful instinct:—"The animal closes the entrance of its burrow, which is situated near the margin of the sea, or in marshy grounds, with its largest claw. These burrows are cylindrical, oblique, very deep, and very close to each other; but generally each burrow is the exclusive habitation of a single individual. The habit which these crabs haveof holding their large claw elevated in advance of the body, as if making a sign of beckoning to some one, has obtained for them the name of Calling Crabs. There is a species observed by Mr. Bosc in South Carolina, which passes the three months of the winter in its retreat without once quitting it, and which never goes to the sea except at the epoch of egg-laying." The same observations apply to the Chevalier Crabs (so called from the celerity with which they traverse the ground). These are found in Africa, and along the borders of the Mediterranean.
Some Crabs, truly aquatic, as the Vaulted Crab of the Moluccas, have the power of drawing back their limbs, and concealing them in a furrow, which they closely fit; and thus, in imitation of a tortoise, which retracts its feet and head within its shell, they secure themselves, when alarmed. Other aquatic species have their limbs adapted for clinging to weeds and other marine objects. Of these some have the two or four hind pairs of limbs so placed as to appear to spring from the back; they terminate in a sharp hook, by means of which the Crab attaches itself to the valves of shells, fragments of coral, &c., which it draws over its body, and thus lurks in concealment. Allied, in some respects, to the Hermit or Soldier Crabs, which tenant empty shells, is one which, from its manners and habits, is one of the most extraordinary of its race. The Hermit Crabs are voracious, and feed on animal substances. The Hermit, or Bernhard Crab, is so called from itshabit of taking up its solitary residence in deserted shells, thus seeking a protection for its tail, which is long and naked. It is found in shells of different dimensions, and from time to time leaves its abode, as it feels a necessity, for a more commodious dwelling. It is said to present, on such occasions, an amusing instinct as it inserts the tail successively into several empty shells until one is found to fit. We learn from Professor Bell, however, that it does not always wait until the home is vacant, but occasionally rejects the rightful occupant with some violence. On the contrary, the Crab, or rather Lobster-Crab (for it takes an intermediate place between them), is more delicate in its appetite, and feeds upon fruits, to obtain which it is said to climb up certain trees, at the feet of which it makes a burrow. This species is the Purse Crab, or Robber Crab, of Amboyna and other islands in the South Pacific Ocean.
"According to popular belief among the Indians," says Cuvier, "the Robber Crab feeds on the nuts of the cocoa-tree, and it makes its excursions during the night; its places of retreat are fissures in the rocks, or holes in the ground." The accounts of the early writers and travellers, as well as of the natives, were disbelieved; but their truth has since been abundantly confirmed. MM. Quoy and Guimard assure us that several Robber Crabs were fed by them for many months on cocoa-nuts alone; and a specimen of this Crab was submitted to the Zoological Society, with additional information fromMr. Cuming, in whose fine collection from the islands of the South Pacific several specimens were preserved. Mr. Cuming states these Crabs to be found in great numbers in Lord Hood's Island, in the Pacific. He there frequently met with them on the road. On being disturbed, the Crabs instantly assumed a defensive attitude, making a loud snapping with their powerful claws, or pincers, which continued as they retreated backwards. They climb a species of palm to gather a small kind of cocoa-nut that grows thereon. They live at the roots of trees, and not in the holes of rocks; and they form a favourite food among the natives. Such is the substance of Mr. Cuming's account. Mr. Darwin, in his "Researches in Geology and Natural History," saw several of these Crabs in the Keeling Islands, or Cocos Islands, in the Indian Ocean, about 600 miles distant from the coast of Sumatra. In these islands, of coral formation, the cocoa-nut tree is so abundant as to appear, at first glance, to compose the whole wood of the islands.
Here the great Purse Crab is abundant. Mr. Darwin describes it as a Crab which lives on the cocoa-nut, is common on all parts of the dry land, and grows to a monstrous size. This Crab has its front pair of legs terminated by very strong and heavy pincers, and the last pair by others which are narrow and weak. It would at first be thought quite impossible for a Crab to open a strong cocoa-nut, covered with the husk; but Mr. Liesk assures me that he has repeatedly seen the operation effected. The Crabbegins by tearing away the husk, fibre by fibre, and always from that end under which the three eye-holes are situated. When this is completed the Crab commences hammering with its heavy claws on one of these eye-holes till an opening is made. Then, turning its body, by the aid of its posterior and narrow pair of pincers, it extracts the white albuminous substance. I think this as curious a case as I ever heard of, and likewise of adaptation in structure between two objects apparently so remote from each other in the scheme of nature as a Crab and a cocoa-nut tree. The Crab is diurnal in its habits; but it is said to pay every night a visit to the sea for the purpose of moistening its gills. These gills are very peculiar, and scarcely fill up more than a tenth of the chamber in which they are placed: it doubtless acts as a reservoir for water, to serve the Crab in its passage over the dry and heated land. The young are hatched and live for some time on the coast; at this period of existence we cannot suppose that cocoa-nuts form any part of their diet; most probably soft saccharine grasses, fruits, and certain animal matters, serve as their food until they attain a certain size and strength.
The adult Crabs, Mr. Darwin tells us, inhabit deep burrows, which they excavate beneath the roots of trees; and here they accumulate great quantities of the picked fibres of the cocoa-nut husk, on which they rest as on a bed. The Malays sometimes take advantage of the labours of the Crab by collecting the coarse fibrous substance, and using it as junk.These Crabs are very good to eat; moreover, under the tail of the larger ones there is a great mass of fat, which, when melted, yields as much as a quart bottleful of limpid oil.
The Crab's means of obtaining the cocoa-nuts have, however, been much disputed. It is stated by some authors to crawl up the trees for the purpose of stealing the nuts. This is doubted; though in the kind of palm to which Mr. Cuming refers as being ascended by this Crab, the task would be much easier. Now, Mr. Darwin states, that in the Keeling Islands the Crab lives only on the nuts which fall to the ground. It may thus appear that Mr. Cuming's and Mr. Darwin's respective accounts of thenon-climbingof this Crab on the one side, and itsactually climbing treeson the other, are contradictory. The height of the stem of the cocoa-nut tree, its circumference, and comparative external smoothness, would prove insurmountable, or at least very serious obstacles, to the most greedy Crab, however large and strong it might be. But these difficulties are by no means so formidable in the tree specified by Mr. Cuming: this is arborescent, or bushy, with long, thin, rigid, sword-shaped leaves, resembling those of the pineapple, usually arranged spirally, so that they are commonly called Screw Pines. They are of the genusPandanus, a word derived from the MalayPandang. The ascent of these arborescent plants, having the stem furnished with a rigging of cord-like roots, and bearing a multitude of firm, long, and spirally-arranged leaves, would be by no meansa work of difficulty, as would necessarily be that of the tall feathery-topped cocoa-tree, destitute of all available points of aid or support. Hence the contradiction in the two accounts referred to is seeming, and not real, and the two statements are reconciled.
To sum up, Mr. Cuming fully testifies to the Crab climbing the Screw Pines; and he has told Professor Owen that he has actually seen the Crab climbing the cocoa-nut tree. The Crab has been kept on cocoa-nuts for months; and is universally reported by the natives to climb the trees at night.
THE TREE-CLIMBING CRAB.
THE TREE-CLIMBING CRAB.
We may here, too, observe, that fine specimens of the Climbing Crab are to be seen in the British Museum. Here, too, arranged in cases, are Spider Crabs; Crabs with oysters growing on their backs, thus showing that Crabs do not shed their shells every year, or that the oyster increases very rapidly in bulk; Oval-bodied Crabs; and Fin-footed or Swimming Crabs. Here are also Telescope, or Long-eyed Crabs, and Land Crabs, found in India 4,000 feet above the sea-level; another of similar habits in the plains of the Deccan, that may be seen swarming in the fields, some cutting and nipping the green rice-stalks, and others waddling off backwards with sheaves bigger than themselves. To these may be added Square-bodied Crabs, Crested Crabs; Porcelain Crabs, with delicate, china-like shells; and Death's-head Crabs, which usually form cases for themselves from pieces of sponge and shells.
Certain species of Crabs are remarkably tenacious of life, and have been known to live for weeksburied, and without food. It is in the Crab tribe that the fact of the metamorphosis ofcrustaceahas been most distinctly perceived; a small, peculiar crustacean animal, that had long passed for a distinct species, under the name ofZoea, having at length been identified with the young of the common Crab before it had attained its full development.
That among the Crab tribes a tree-climbing species is to be found is certainly curious, but it is not without a parallel among fishes. Many of the latter leave the water, some even for a long time, and perform overland journeys, aided in their progress by the structure of their fins. In these fishes the gills and gill-chambers are constructed for the retention of water for a considerable time, so as to suffice for the necessary degree of respiration. In our country, we may mention the eel, which often voluntarily quits the river or lake, and wanders during the night over the adjacent meadows, probably in quest of dew-worms. But the marshes of India and China present us with fishes much more decidedly terrestrial, and some of which were known to the ancients. Among these are several fishes of a snake-like form: they have an elongated, cylindrical body, and creep on land to great distances from their native waters. The boatmen of India often keep these fishes for a long time out of water, for the sake of diverting themselves and others by their terrestrial movements, and children may often be seen enjoying this sport.
Of these land-haunting fishes, the most remarkableis the tree-climber, so called in Tranquebar. This fish inhabits India, the Indian islands, and various parts of China, as Chusan, &c., living in marshes, and feeding on aquatic insects, worms, &c. According to Daldorf, a Danish gentleman, who, in 1797, communicated an account of the habits of this fish to the Linnæan Society, itmounts upthe bushes or low palms to some elevation. This gentleman states that he had himself observed it in the act of ascending palm-trees near the marshes, and had taken it at a height of no less than five feet, measured from the level of the adjacent water. It effects its ascent by means of its pectoral and under fins, aided by the action of the tail and the spines which border the gill covers. It is by the same agency that it traverses the land. The statement of M. Daldorf is corroborated by M. John, also a Danish observer, to whom we are indebted for the knowledge of its name in Tranquebar, which alludes to its arboreal proceedings.
It is true that many other naturalists who have observed the habits of this fish in its native regions, while they concur in describing its terrestrial journeys, and its living for a long time out of water, either omit to mention, or mention with doubt, its reputed attempts attree-climbing.
The habits and instincts of certain Crawfishes are very extraordinary. Thus, theAstaciare migratory, and in their travels are capable of doing much damage to dams and embankments. On the Little Genesee River they have, within a few years, compelledthe owner of a dam to rebuild it. The former dam was built after the manner of dykes,i.e., with upright posts, supporting sleepers, laid inclining up the stream. On these were laid planks, and the planks were covered with dirt. TheAstacusproceeding up the stream would burrow under the planks where they rested on the bottom of the stream, removing bushels of dirt and gravel in the course of a night. They travel over the dam in their migrations,often climbing poststwo or three feet high to gain the pond above.[22]
We have to add a new and eccentric variety of nature—the Pill-making Crab, which abounds at Labuan, Singapore, and Lahore, and is described in Mr. Collingwood's "Rambles of a Naturalist." When the tide is down, this little creature, if stealthily watched, may be seen creeping up a hole in the sandy shore, taking up rapidly particles of the loose powdery sand in its claws, and depositing them in a groove beneath the thorax. A little ball of sand, about the size of a filbert, is forthwith projected, though whether it passes actually through the mouth is not made clear. Pill after pill is seized with one claw, and laid aside, until the beach is covered with these queer little pellets. This is evidently the creature's mode of extracting particles of food from the sand.
Mr. Collingwood also describes, as met with on the shores and waters of the China seas, Glass Crabs, whose flat, transparent, leaf-like bodies seem madeof fine plates of mica. The dredge brings up many a rich haul of sponges, corals, and gorgoniæ, of the most splendid colours, certain of the sponges harbouring within their cells minute crabs of a new genus. Between Aden and Galle the sea is of a pinkish colour, owing to the immense accumulation of minute kinds of medusæ, in solid masses of red jelly. Over Fiery Cross Reef, the mirror-like sea reveals, at the depth of sixty or seventy feet, this wealth of natural treasures. "Glorious masses of living coral strew the bottom: immense globular madrepores—vast overhanging mushroom-shaped expansions, complicated ramifications of interweaving branches, mingled with smaller and more delicate species—round, finger-shaped, horn-like and umbrella-form—lie in wondrous confusion. Here and there is a large clam-shell, wedged in between masses of coral, the gaping, zigzag mouth covered with the projecting mantle of the deepest Prussian blue; beds of dark purple, long-spined Echini, and the thick black bodies of sea-cucumbers vary the aspect of the sea bottom."[23]