Leeches,241,392f.—see also HirudineaLeeuwenhoek, on Rotifera,197Legrain, on Nematodes in deserts,156Legros, onTrichina,146Lehnert, onBipalium,36,37Leidy, on Rotifers,198Leimacopsis,37,42Lemnisci,176Lepas, as host,298Lepidasthenia,293,311Lepidoderma,235Lepidonotus(subgenus ofPolynoe), eye,255Lepralia,516,518,528,530,531n.;L. foliacea,478,527;larva,511Leprea,328Leptodera,129,131,133,160Leptoplana,7,8,9,11,14,17;British species,19;habits,8f.;anatomy,11f.Leptoplanidae,19Leptostoma,396Lesson, on Polyclads,24Leuciscus, parasites of,173,182Leuckart, on Platyhelminthes,6,64f.,70,76;on Nemertinea,99;on Nematoda,136,139,140,142,146,163;on Hirudinea,395Leucochloridium,65,66Leucocytes, of Polychaeta,252Leucodore—seePolydoraLeydig, on Rotifers,198Lias, Serpulids in,301Libyodrilus,364,385,386Lichenopora,518,531Life-history, of Trematodes,4;of Polystomatidae (Polystomum,Diplozoon,Gyrodactylus),58f.;of digenetic Trematodes,63f.;table of,71;of Cestodes,5f.,87;table of life-histories of Cestodes,83;ofDipylidium,88;of Dicyemidae,93;of Nematoda,159;ofGordius,170;of Acanthocephala,179—see also DevelopmentLigula,91;occurrence,85Ligulinae,91Lim Boon Keng, on Earthworms,349Lima, nests of,298Lime, secreted by Serpulidae,290Limnaea truncatula, host of larvae ofDistomum hepaticum,67,72Limnatis,407Limnias,205,221;early description of,197Limnodrilus,378Lineus,111;L. marinus(=L. longissimus),99,100,111,114;Borlase on,99;size of,100;L. gesserensis(=L. obscurus=L. sanguineus), recuperative powers of,116Linguatulida, affinities of,344Linnaeus, on Cestodes,78;on Gephyrea,411;on Polyzoa,474Linstow, von, on classification of Nematodes,137;on life-history ofAscaris lumbricoides,140;on parasitism,162;onGordius,166,171,173Lip, lip-membrane, lip-processes, of Sabellidae,261,337Lipobranchius,334;shape of body,259Lipochromes, in Polychaeta,292Lister, on Polyzoa,497Lithodomous, Polychaeta,287Lithographic slate, fossil Polychaeta from,301,302Liver, -fluke,51;-rot,68Locomotion, of Planarians,9,10,36;of Polyclads,22f.;of Nemertinea,114,115;of Chaetognatha,190;of Rotifers, etc.,206,235;ofDinophilus,243;of Phylactolaemata,496Looss, on Trematoda,62n.,66,70Lopadorhynchina,314Lopadorhynchus,314;L. erythrophyllum, colour of,292Lophochaeta,351;chaeta,350Lophohelia, withEunice,298,319Lophophore, inPhoronis,453;in Polyzoa,476,476,495Lophopus,494,499,504,505,518,519;movements,496,497;fission,496,506;statoblast,502,503Lorica, in Rotifers,205Loricata,205,224Lota, parasites of,182Loxosoma,489f.,489,490,506,518;on Polychaeta,299,489;on other animals,489;buds,489,490,506;larva,509Lug-worm, castings of,285;as bait,297Lumbricaria,302Lumbricidae,362,371f.,388Lumbricobdella,392Lumbriconereis,318,320;from fresh water,284Lumbriconereites(misprinted in text),302Lumbriculidae,350,361,379Lumbriculus,379;as host of Rotifer,211n.Lumbricus,349,351,356,367,368,371,389f.,403f.;generative organs,362;cocoon,365Lunulites,518;vibracula,487Lurg,317Lycoridae,315Lysidice,297,320MacGillivray, on Polyzoa,519M‘Intosh, on Nemertinea,110n.,115,116;onPhoronis,454Macraspis,73Macrobdella,393,406;sense-body,394Macrorhynchus,44,47;British species,49Macrostoma,44,47;British species,49Macrostomatidae,49Magelona,325;haemerythrin in,252Magelonidae,258,325Main-gut, ofLeptoplana,8,13;of Polyclads,17Malacobdella,101;description of,119;M. grossa,110,119;excretory system of,108Malacocotylea (= Digenea),73Maldanidae (= Clymenidae),258,332;shields,259;anal funnel,259;chaetae,266,267,268;colour,293Male, of Rotifers,199,200,217,223n.;of Echiuroids,438Malleate,210Malleoramate,210,211Malleus,210Mammals, Trematodes of,62,63,67-70,71f.;Cestodes of,77-84,89-91;Nematodes of,163;Acanthocephala of,183,184Man, Trematode-parasites of,63,68-70;Cestodes of,74,78-81,83,89f.;Nematodes of,125,139,140,143,145,147,163;Gordiusof,173;Echinorhynchusof,183Man, De, on free-living Nematodes,157Manayunkia,284,339n.Mandible, of avicularium,482,524Manson, onFilaria,149Manubrium,210Marginal groove, ofLeptoplana,15Maricola,30,32,42Marine, Rotifers,226;Oligochaeta,366;Leeches,406Marphysa,276,319;as bait,297;as host,297Mastax, of Rotifers,199,210Masterman, on Chaetognatha,190;onPhoronis,461Mastigocerca,225Mastigophora,518,529;vibraculum,484Mastobranchus, gill of,268,331Matzdorf, on Leeches,369Maupas, on Rotifers,217Mbalolo,297Meckelia asulcata,111Mecynostoma,49Median pore, in Cheilostomata,484,524Megadrili,373,374,380f.Megalotrocha,221Megapora,530Megascolex,351,372,381,383Megascolides,349,358,372,382;body-wall and nephridia,357Mégnin, on parasites,164Meissner, on Polyzoa,493Melania,Coabangiain shell of,284Melanin,292Melicerta,202,205,206,210,215,218,219,221,226;early description of,197Melicertaceae,203,221Melicertidae,201,203,205,211,213,221Melinna,330Membranipora,481,492,518,519,523,528,530;phosphorescence,478;function of aperture,500;larva,509,510;variation,516Membraniporella,518,524,528Menipea,518,526,527Mermis,131,150,160,163Mermithidae,150,163Meromyarii,129,137,142Mertens, on Polyclads,6,23Mesobdella,407Mesocestoides,91;M. lineatus, life-history,84;specific characters,90Mesonemertini,112Mesostoma,44,45;reproduction,48;British species,49Mesostomatidae,49Mesotrochal larva,325Mesozoa,92f.Metamerism,249Metamorphosis, in Polycladida,16,28;in Trematodes,5,66f.;in Cestodes,5,74,76,87-89;inPhoronis,459;in Polyzoa,512Metanemertini,112Metastatica (= Holostomatidae),73;life-histories,64Metopidia,200,225Metschnikoff, on Orthonectida,94;on Nemertines,99;on Chaetosomatidae,158Meyer, on Polychaeta,261Michaelsen, on Earthworms,349,353,359,370f.,375,385Microchaeta,362Microcodides,224Microcodon,202,215,224,230Microcodonidae,202,220n.,224Microcotyle,73;eggs ofM. labracis,58Microcotylinae,73Microdrili,373,374f.Microplana,34,42Micropora,518,530;zooecium,523Microporella,516,518,519,529;avicularia,484,485;median pore,501Microscolex,372,382,383,384Microstoma,44;asexual reproduction,44;sexual organs,47;British species,49Microstomatidae,49Micrura,101,114;British species,111Migrations, of Trematode-larvae,5,52,63f.;of Cestode-larvae,5,74,83,87Millson, on Oligochaeta,368,387Millsonia,382f.Milne-Edwards, on Polyzoa,475Mimicry, in Polychaeta,293f.Mimosella,518,532;movement of zooecia,481Molluscoidea,475Molops, host ofGordius,172Monhystera,160Moniez, on Cestodes,84n.,85;on Earthworms,369Moniezia,83,91;characters of genus,90;M. alba,M. benedeni,M. denticulata,90;M. expansa,83,90;M. neumani,M. oblongiceps,M. planissima,M. trigonophora,90Moniligaster,359,380,402Moniligastridae,361,373,380Monkey, parasites of,145Monocotyle,73Monocotylinae,73Monogenea (Monogenetic Trematodes),5,53;classification,73Mononchus,154Monoophorum striatum,50Monopora vivipara,117Monoporus rubropunctatus,49;reproductive organs of,47
Leeches,241,392f.—see also Hirudinea
Leeuwenhoek, on Rotifera,197
Legrain, on Nematodes in deserts,156
Legros, onTrichina,146
Lehnert, onBipalium,36,37
Leidy, on Rotifers,198
Leimacopsis,37,42
Lemnisci,176
Lepas, as host,298
Lepidasthenia,293,311
Lepidoderma,235
Lepidonotus(subgenus ofPolynoe), eye,255
Lepralia,516,518,528,530,531n.;
L. foliacea,478,527;
larva,511
Leprea,328
Leptodera,129,131,133,160
Leptoplana,7,8,9,11,14,17;
British species,19;
habits,8f.;
anatomy,11f.
Leptoplanidae,19
Leptostoma,396
Lesson, on Polyclads,24
Leuciscus, parasites of,173,182
Leuckart, on Platyhelminthes,6,64f.,70,76;
on Nemertinea,99;
on Nematoda,136,139,140,142,146,163;
on Hirudinea,395
Leucochloridium,65,66
Leucocytes, of Polychaeta,252
Leucodore—seePolydora
Leydig, on Rotifers,198
Lias, Serpulids in,301
Libyodrilus,364,385,386
Lichenopora,518,531
Life-history, of Trematodes,4;
of Polystomatidae (Polystomum,Diplozoon,Gyrodactylus),58f.;
of digenetic Trematodes,63f.;
table of,71;
of Cestodes,5f.,87;
table of life-histories of Cestodes,83;
ofDipylidium,88;
of Dicyemidae,93;
of Nematoda,159;
ofGordius,170;
of Acanthocephala,179—see also Development
Ligula,91;
occurrence,85
Ligulinae,91
Lim Boon Keng, on Earthworms,349
Lima, nests of,298
Lime, secreted by Serpulidae,290
Limnaea truncatula, host of larvae ofDistomum hepaticum,67,72
Limnatis,407
Limnias,205,221;
early description of,197
Limnodrilus,378
Lineus,111;
L. marinus(=L. longissimus),99,100,111,114;
Borlase on,99;
size of,100;
L. gesserensis(=L. obscurus=L. sanguineus), recuperative powers of,116
Linguatulida, affinities of,344
Linnaeus, on Cestodes,78;
on Gephyrea,411;
on Polyzoa,474
Linstow, von, on classification of Nematodes,137;
on life-history ofAscaris lumbricoides,140;
on parasitism,162;
onGordius,166,171,173
Lip, lip-membrane, lip-processes, of Sabellidae,261,337
Lipobranchius,334;
shape of body,259
Lipochromes, in Polychaeta,292
Lister, on Polyzoa,497
Lithodomous, Polychaeta,287
Lithographic slate, fossil Polychaeta from,301,302
Liver, -fluke,51;
-rot,68
Locomotion, of Planarians,9,10,36;
of Polyclads,22f.;
of Nemertinea,114,115;
of Chaetognatha,190;
of Rotifers, etc.,206,235;
ofDinophilus,243;
of Phylactolaemata,496
Looss, on Trematoda,62n.,66,70
Lopadorhynchina,314
Lopadorhynchus,314;
L. erythrophyllum, colour of,292
Lophochaeta,351;
chaeta,350
Lophohelia, withEunice,298,319
Lophophore, inPhoronis,453;
in Polyzoa,476,476,495
Lophopus,494,499,504,505,518,519;
movements,496,497;
fission,496,506;
statoblast,502,503
Lorica, in Rotifers,205
Loricata,205,224
Lota, parasites of,182
Loxosoma,489f.,489,490,506,518;
on Polychaeta,299,489;
on other animals,489;
buds,489,490,506;
larva,509
Lug-worm, castings of,285;
as bait,297
Lumbricaria,302
Lumbricidae,362,371f.,388
Lumbricobdella,392
Lumbriconereis,318,320;
from fresh water,284
Lumbriconereites(misprinted in text),302
Lumbriculidae,350,361,379
Lumbriculus,379;
as host of Rotifer,211n.
Lumbricus,349,351,356,367,368,371,389f.,403f.;
generative organs,362;
cocoon,365
Lunulites,518;
vibracula,487
Lurg,317
Lycoridae,315
Lysidice,297,320
MacGillivray, on Polyzoa,519
M‘Intosh, on Nemertinea,110n.,115,116;
onPhoronis,454
Macraspis,73
Macrobdella,393,406;
sense-body,394
Macrorhynchus,44,47;
British species,49
Macrostoma,44,47;
British species,49
Macrostomatidae,49
Magelona,325;
haemerythrin in,252
Magelonidae,258,325
Main-gut, ofLeptoplana,8,13;
of Polyclads,17
Malacobdella,101;
description of,119;
M. grossa,110,119;
excretory system of,108
Malacocotylea (= Digenea),73
Maldanidae (= Clymenidae),258,332;
shields,259;
anal funnel,259;
chaetae,266,267,268;
colour,293
Male, of Rotifers,199,200,217,223n.;
of Echiuroids,438
Malleate,210
Malleoramate,210,211
Malleus,210
Mammals, Trematodes of,62,63,67-70,71f.;
Cestodes of,77-84,89-91;
Nematodes of,163;
Acanthocephala of,183,184
Man, Trematode-parasites of,63,68-70;
Cestodes of,74,78-81,83,89f.;
Nematodes of,125,139,140,143,145,147,163;
Gordiusof,173;
Echinorhynchusof,183
Man, De, on free-living Nematodes,157
Manayunkia,284,339n.
Mandible, of avicularium,482,524
Manson, onFilaria,149
Manubrium,210
Marginal groove, ofLeptoplana,15
Maricola,30,32,42
Marine, Rotifers,226;
Oligochaeta,366;
Leeches,406
Marphysa,276,319;
as bait,297;
as host,297
Mastax, of Rotifers,199,210
Masterman, on Chaetognatha,190;
onPhoronis,461
Mastigocerca,225
Mastigophora,518,529;
vibraculum,484
Mastobranchus, gill of,268,331
Matzdorf, on Leeches,369
Maupas, on Rotifers,217
Mbalolo,297
Meckelia asulcata,111
Mecynostoma,49
Median pore, in Cheilostomata,484,524
Megadrili,373,374,380f.
Megalotrocha,221
Megapora,530
Megascolex,351,372,381,383
Megascolides,349,358,372,382;
body-wall and nephridia,357
Mégnin, on parasites,164
Meissner, on Polyzoa,493
Melania,Coabangiain shell of,284
Melanin,292
Melicerta,202,205,206,210,215,218,219,221,226;
early description of,197
Melicertaceae,203,221
Melicertidae,201,203,205,211,213,221
Melinna,330
Membranipora,481,492,518,519,523,528,530;
phosphorescence,478;
function of aperture,500;
larva,509,510;
variation,516
Membraniporella,518,524,528
Menipea,518,526,527
Mermis,131,150,160,163
Mermithidae,150,163
Meromyarii,129,137,142
Mertens, on Polyclads,6,23
Mesobdella,407
Mesocestoides,91;
M. lineatus, life-history,84;
specific characters,90
Mesonemertini,112
Mesostoma,44,45;
reproduction,48;
British species,49
Mesostomatidae,49
Mesotrochal larva,325
Mesozoa,92f.
Metamerism,249
Metamorphosis, in Polycladida,16,28;
in Trematodes,5,66f.;
in Cestodes,5,74,76,87-89;
inPhoronis,459;
in Polyzoa,512
Metanemertini,112
Metastatica (= Holostomatidae),73;
life-histories,64
Metopidia,200,225
Metschnikoff, on Orthonectida,94;
on Nemertines,99;
on Chaetosomatidae,158
Meyer, on Polychaeta,261
Michaelsen, on Earthworms,349,353,359,370f.,375,385
Microchaeta,362
Microcodides,224
Microcodon,202,215,224,230
Microcodonidae,202,220n.,224
Microcotyle,73;
eggs ofM. labracis,58
Microcotylinae,73
Microdrili,373,374f.
Microplana,34,42
Micropora,518,530;
zooecium,523
Microporella,516,518,519,529;
avicularia,484,485;
median pore,501
Microscolex,372,382,383,384
Microstoma,44;
asexual reproduction,44;
sexual organs,47;
British species,49
Microstomatidae,49
Micrura,101,114;
British species,111
Migrations, of Trematode-larvae,5,52,63f.;
of Cestode-larvae,5,74,83,87
Millson, on Oligochaeta,368,387
Millsonia,382f.
Milne-Edwards, on Polyzoa,475
Mimicry, in Polychaeta,293f.
Mimosella,518,532;
movement of zooecia,481
Molluscoidea,475
Molops, host ofGordius,172
Monhystera,160
Moniez, on Cestodes,84n.,85;
on Earthworms,369
Moniezia,83,91;
characters of genus,90;
M. alba,M. benedeni,M. denticulata,90;
M. expansa,83,90;
M. neumani,M. oblongiceps,M. planissima,M. trigonophora,90
Moniligaster,359,380,402
Moniligastridae,361,373,380
Monkey, parasites of,145
Monocotyle,73
Monocotylinae,73
Monogenea (Monogenetic Trematodes),5,53;
classification,73
Mononchus,154
Monoophorum striatum,50
Monopora vivipara,117
Monoporus rubropunctatus,49;
reproductive organs of,47