Paguridea,61Paguropsisand Sea-anemones,214Palæmon,179:used for food,248Palæmonetes,174Palinura,59Palinuridæ,241:fossil,269Palinurus, larva of,72:fishery,240Palp,14Pandalus,59,137:used for food,245Panulirus,241Paracyamus,55Paranaspides,264Paranephrops,177Parapagurus,124:and Sea-anemones,213Parasitism,208Parastacidæ,176Parastacus,178Partan,248Parthenogenesis,163:of Cladocera,166;of Ostracoda,172Pea Crab,217Pedunculata,43Peltogaster,232Penæidea,59:fossil,267Penæus,59:larvæ,73;used for food,247;fossil,268Peracarida,46:development,78Pericardium,17Peripatus, tracheæ of,204Peter's stone,220Philomedes,38Phosphorescence. See LuminosityPhotophores of Euphausiacea,125Phreatoicidea,173Phronima,154Phronimidæ, eyes of,154Phtisica,54Phyllocarida,261Phyllosoma,149:of Spiny Lobster,72Phylogeny,205,256Pill Millipede,203Pink Shrimp,137,245Pinnaxodes,218Pinnotheres,217:used for food,249Planes,155Plankton,139:of fresh water,160;of lakes,168,170;relation to fisheries,250Platyarthrus,205Platycuma,129Platymaia,130Platytelphusa,184Pleuron,9Podocopa,39Podocrates,269Pollicipesused for food,237:fossil,261Polycheles,133Pontonia,218Pontoporeia,181Porcelain Crab: zoëa of,70:autotomy,114;feeding,115;and Hermit Crabs,215Porcellana: zoëa of,70:autotomy,114;feeding,116Porcellanidæ,60Porcellio,51:structure and habits,202;distribution,206Portunidæ: swimming,90:sand-burrowing,99;used for food,249Potamobiidæ,176Potamobius,174Potamon,180:young of,78Præanaspides,265Prawns,58:luminosity of,127;of deep sea,136;of fresh water,174,179;of Tanganyika,183;blind, in caves,185;in Sponges,210;Isopods parasitic on,221;Common,245;used for food,245;deep-water,247;fossil,268Prosoponidæ,135,269Protandrous hermaphroditism,221Protective resemblance,108Protocarcinus,269Protocaris,260Protopodite,10Protozoëa ofPenæus,75Psathyrocaris,130Pseudothelphusa,193Pseudo-tracheæ,202Pygidium,259Pygocephalus,263Pylocheles,94Pylochelidæ of deep sea,136Recapitulation, theory of,86Red-clawed Crayfish,242Regeneration in Lobster,30Relict faunas,182Remipes,102Reproduction of Cladocera,166:ofLeptodora,169;of Cymothoinæ,220Reptantia,59Respiration in sand-burrowing Crabs,99:in amphibious Crabs,106;in Land Crabs,193;inCœnobita,195;inBirgus,196;in Land Isopods,201,202,203Resting eggs of Cladocera,166:of Copepoda,170Resting stage of Copepoda,171Reversal of asymmetry in Lobster,30Rhizocephala,43:larvæ,84;structure and development,231River Crabs: young of,78:habits and distribution,180;development of,193River Prawns,179:used for food,248Robber Crab,61,94:habits and structure,195;breeding,199Robertson, David, on habits of Crabs,97Rock Lobster. See Spiny LobsterRostrum of Lobster,6Sacculina,231Salt lakes, Branchiopoda of,165Sand-burrowing Crustacea,97Sand-hoppers,52:habits,107,189Sapphirina,150Sargasso Sea,155Scampo,240Scapellum, fossil,261Scaphognathite,19Schizopod Stage of Lobster,71:ofPenæus,75Scylla,249Scyllaridæ, fossil,269Scyllaridea,59:Phyllosoma larvæ,149;fossil,268Scyllarus, fossil,269Sea-slater,200Sea-anemones: and Hermit Crabs,213:carried by Crab,215Sea-crawfish. See Spiny LobsterSea-urchin, Crab living in,218Sedentary Crustacea,114Self-mutilation in Lobster,30Senses of Lobster,25Sergestes, zoëa of,75,148Serial homology,10Sesarma, habits,180,189Sessile Barnacles,43Sexes of Lobster,26Sexual characters of Crabs infected withSacculina,235Sharks, Barnacle parasitic on,235Shore Crab,64:larval stages,68;habits,107,188;infested bySacculina,231;used for food,249Shrimps,58:fresh-water,53,172;Common, habits of,97;protective resemblance,108;living with Mollusc,218;fishery,244.See also Brown Shrimp, Pink Shrimp, etc.Sight, sense of, in Lobster,21Skeleton Shrimps,109Slaters,51:Sea-,200Sloane, H., on Gulf-weed Crab,155Smell, sense of, in Lobster,24Smith, G.: on terrestrial Amphipoda,189:on development ofSacculina,233Smith, S. I., on habits ofOcypode,105Somites of Lobster,6,8Southern Crayfishes,176Spencer and Hall on Australian Branchiopoda,161,163Sperm-receptacle of Lobster,27Spider Crabs,64:masking habits,96,215;deep-sea,128Spiny Lobster,59:larva of,72;fishery,240Spirontocaris, Isopod parasitic on,221Sponge Crab,95Sponges, Crustacea in,210Spongicola,210Squilla,64:larva of,80;fossil,266Stalked Barnacles,43Statocyst of Lobster,24:of Mysidacea,47Statolith,47Stebbing, T. R. R.: on Land Crabs,190:on habits ofCirolana,219Steinkrebs,242Stenopidea,59:fossil,267Stenorhynchus,97Sternum,9Stevenson, R., on the Gribble,254Stomach of Lobster,16Stone Crab,61,94Stomatopoda,64:larvæ,80;habits,104;fossil,266Stridulating organ ofOcypode,105Subterranean Crustacea,184Swimmerets of Lobster,6,10Swimming Crabs,90:sand-burrowing,99;used for food,249Symbiosis,207Syncarida,45,181:fossil,264Tail-fan of Lobster,6Talitridæ,107Talitrus: habits,107:terrestrial Species,189Tanaidacea,50Tanganyika, Lake, Crustacea of,183Taste, sense of, in Lobster,25Telphusa,180Telson of Lobster,6Tergum,9Testis of Lobster,27Thalassinidea,61:habits,103Thaumastocheles,130,132Thompson, J. Vaughan: discovery of metamorphoses of Crustacea,67:on larvæ of Cirripedia,83;on development ofSacculina,232Thoracica,43Thorax of Lobster,7Thread-worms,252Touch, sense of, in Lobster,22Tracheæ,204Tracheæ, pseudo-,202Trapeziidæ,211Triarthrus,258Trilobites, structure and history,258Tubicinella,209Turrilepas,261Turtles: Barnacles on,209:Gulf-weed Crab on,209Underground Crustacea,184Uropods of Lobster,6Venus's Flower-basket, Crustacea in,210Water-fleas,37,165Weismann on parthenogenesis ofCypris,172Well Shrimp,184Westwood, J. O., on development of Land Crabs,192Whales, Barnacles on,209Whale-food,138Whale-lice,56:habits,224White-clawed Crayfish,242Willey, A., on breeding of Robber Crab,199Williamson, H. C., on habits of Lobster,25Wood-boring Crustacea,253Woodlice,51:development of,79;habits and structure,199;distribution of,206;destructive in gardens,253Worms: and Hermit Crabs,215:Copepoda parasitic in,230Zoëa of Shore Crab,69:of Caridea,73;of Porcelain Crab,70;ofMunida,71;ofPenæus,75;ofSergestes,75,148;of Robber Crab,199