INDEX 



679 



Infundibulum of Ctenophora, 561 

 Inhalent pores of Grantia, formation of, 43 

 Ink-gland, formation of, in Loligo, 358 

 Inner segment of lens, formation of, in 



Cephalopod eye, 366 



Insecta, 169, 177, 204, 281, 282, 284, 285, 

 652, 662 ; embryonic development of, 

 245-266 ; metamorphosis of, 266-280 

 Insecta Hexapoda, 245 

 Instar, definition of, 19 

 Intercalary segment in embryo of Donacia, 

 252 ; in embryo of Lepisma, 265 ; in 

 embryo of Scolopendra, 282 

 Intermediate cells of Molluscan cross in 



embryo of Patella, 294 

 Intermediate dorsal arms of ciliated band in 



larva of Synapta digitata, 533 

 Intermediate girdle-cells, degeneration of, in 

 larva of Polygordius appendiculatus, 149 ; 

 formation of, in embryo of Pliascolosoma, 

 374 



Internal madreporite, formation of, in An- 

 tarctic Cucumaria, 542 ; in Synapta 

 digitata, 539 

 Internal perihaemal ring-canal, formation of, 



in Aster ina gibbosa, 475 

 Internal sac in Cyphouautes larva, 390, 392 

 Internal yolk-sac, formation of, in Loligo, 



360 

 Inter-radial cells of embryo of Polygordius, 



135 



Inter-radial lobe of stomach of Aurelia, 71 

 Inter-radius in egg of Polygordius, 135 

 Intestine, formation of, in Antedon rosacea, 

 552 ; in larva of Asterias, 462 ; in larva 

 of Asterina gibbosa, 472 ; in larva of 

 Balanoglossus clavigerus, 573 ; in Den- 

 talium, 328 ; in Dreissensia, 337 ; in 

 larva of Echinus esculentus, 508 ; in adult 

 Echinus esculentus, 520 ; in Loligo, 364 ; 

 in larva of Membranipora, 390 ; in larva 

 of Ophiothrix fragilis, 487 ; in larva of 

 Pedicellina echinata, 400 ; in larva of 

 Synapta digitata, 532 



Introvert of Pliascolosoma, formation of, 379 

 Invagination in eggs of Astacus, 181 

 Invertebrata, 662 ; embryology of, 30 

 Iris, formation of, in eye of Loligo, 363, 367 

 Islands of embryonic tissue in mid-gut of 



larvae of Muscidae, 279 

 Isopleura, 291 

 Isopoda, 22, 177, 193, 219 



Jaws of Echinus esculentus, formation of, 520 

 Jaw-region of embryo of Donacia, 251 

 Jaw-segments in embryo of Scolopendra, 282 

 Julus, development of, 284 



Karyokinesis of zygote, 9, 10 



Kidneys (see also Excretory organ and 

 Nephridium), formation of, in Dreissensia, 

 343 ; in Loligo, 362 ; in Paludina, 314 ; 



. in Peripatus capensis, 174 ; in Unio, 353 



Krohnia., 428 



Labial palps, formation of, in Dreissensia, 

 344 



Labrum, formation of, in Astacus, 183 ; in 

 Donacia, 252 



Laeotropic cleavage, definition of, 105 



Lamellibranchiata, 291 



Laodice, experiments on the eggs of, 96 



Larva, definition of, 19 



Larva of Amphioxus lanceolatus, 593-600 ; 

 of Antedon rosacea, 547-553 ; of simple 

 Ascidian organization of, 619-622 ; of 

 Asterina gibbosa, 472-477 ; of Coleoptera, 

 287 ; of Cribrella oculata, 481 ; of Cucu- 

 maria planci, 542 ; of Desor, 118 ; of 

 Dolichoglossus kowalevskii, 582 ; ofDolicho- 

 glossus 2 )u sillus, 583 ; of Donacia, 200 ; 

 of Echinodermata, 287 ; Gcderucella ulmi, 

 207 ; of Insecta, interpretation of, 286-288 ; 

 of Julus, 284 ; of Lepidoptera, 266 ; of 

 Muscidae, 278 ; of Ophiura brevispina, 

 502 ; of Pantopoda, 243 ; of Pentastomida, 

 242 ; of Sagitta bipunctata, 433 ; Solastcr 

 endeca, 481, 482 ; of Terebratulina septen- 

 trionalis, 412 



Larvacea, 568, 608, 646 



Larval adductor muscle of Unio, 352 



Larval arms of Asterias, 464 ; of Balano- 

 glossus, 576 ; of Echinocardium cor datum, 

 522 ; of Echinus esculentus, 508-511 ; of 

 Ophiothrix fragilis, 488-490 ; of Synapta 

 digitata, 533 



Larval cerebral ganglion of Polygordius 

 appendiculatus, 147 



Larval eyes in grubs of Doryphora and 

 Donacia, 261 ; in grubs of Dytiscus, 273, 

 274 



Larval history of Anomura, 216 ; of 

 Crustacea, 196-220 



Larval kidney, formation of, of Aplysia, 324 ; 

 in Dreissensia, 340 ; in Fiona, 324 ; in 

 Opistliobranchiata, 323, 324 ; in Paludina, 

 310, 323 ; in Physa, 323 ; in fresh-water 

 Prosobranchiata, 323 ; in Pulmonata, 323 ; 

 in Umbrella, 324 



Larval mantle of Unio, modification of, 352 



Larval mesoderm of Polygordius, 135 ; of 

 Mollusca, 323 



Larval phase, definition of, 19 ; interpreta- 

 tion of, 649 



Larval shell of Acmaea, 304 ; of Fissurella, 

 305 ; of Holiotes, 305 ; of Membranipora, 

 392 ; of Patella, 300 



Larval skeleton, development of, in Amphi- 

 ura squamata, 498 ; in Echinus esculentus, 

 508-510 ; in Ophiothrix fragilis, 487-490 



Larval stages, definition of, 19 



Lateral chamber of Urticina crassicornis, 

 80 



Lateral eyes, formation of, in Agelena, 232- 

 234 ; in Limulus, 237 ; in Scorpion, 240 



Lateral muscles of Cyphonautes larva, 393 ; 

 of Polygordius appendiculatus, 148 



Lateral nerves of larva of Polygordius 

 appendiculatus, 147 



