668 



INVERTEBEATA 



Amphibia, 569 



Aniphiblastula larva, of ^spc^ia, 44 ; of 



Grantia, 39 ; of Leiicosolenia^ 47 ; of 



Oscarella, 43 

 Amphidisc of liud of Ephydatia, 49 

 Amphioxus, 669, 582, 583, 605, 606, 607, 



608, 618, 619, 625, 627, 640, 654 ; larva 



of, 28 

 Amphioxus lanceolatus, development of, 



586-604 

 Amphipoda, 177, 193, 219 

 AmphUrite, 153 

 Amphiura squamata, 484, 503 ; post-larval 



development of, 498-501 

 Ampulla of Ophiothrix fraqilis, formation of, 



491 

 Ampullae of chambered organ of Antedon 



rosacea, formation of, 552 

 Anal cerci of Blatta, formation of, 262 

 Anal cone of larvaof Pe&'ceZKrta echinata, 400 

 Anal field of larva of Asterias, 464 

 Anal ganglia of Agelena, formation of, 



230 

 Anal loop of ciliated band of larva of Synapta 



digitata, 532 ; of ciliated baud of New 



England Tornaria, 576 

 Anal papilla, formation of, in Loligo. 358 

 Anal vesicle of larva of Eupomatus, 154 

 Anamorpha, 284 

 Anaspida, 177 



Ancestral form of Araohnida, 244 

 Ancestral history of Porifera, 51 

 Ancestral significance of Pilidium larva, 127 

 Anisopleura, 291 

 Anisopoda, 177, 219 

 Annelida, 105, 108, 169, 171, 172, 204, 



205, 312, 313, 321, 372, 400, 401, 405, 



406, 408, 414, 415, 416, 427, 433, 435, 



455, 529, 561, 562, 569, 571, 574, 655, 



659, 661, 662 ; affinities of, 163-168 ; 



affinities with Mollusca, 368 ; development 



of, 128-168 ; development of unfertilized 



eggs, 17 ; eggs of, 11 

 Annelidan cross, definition of, 133 ; formation 



of, in segmenting eggs of Gastropoda, 322 ; 



in embryo of Patella, 294 ; in embryo 



of Pliascoloso'ma, 374 ; in embryo of 



Polygordius, 133, 134 

 Anodon, 352 



Anomura, 177, 208, 213, 216 

 Antedon, 22, 565 



Antedon rosacea, development of, 540-558 

 Antenna, formation of, in Astacus, 184 ; in 



Gallidina russeola, 426 ; in Peripatus 



capensis, 171 ; in Trilobite, 238 

 Anteunary sac in larva of Cyclops, 197 

 Autennary segment of Donacia, 252 

 Antennulary ganglion of Astacus, 184 

 Autennules of Astacus, formation of, 184 

 Anterior adductor muscle of Dreissensia, 



formation of, 342 

 Anterior amniotic fold in embryo of Donacia, 



250 ; absent in embryos of Odonata, 266 ; 



present in embryos of Orthoptera, 266 



Anterior aorta of Donacia, formation of, 257 



Anterior chamber of eye in Loligo, formation 

 of, 363 



Anterior ciliated epaulettes of larva of 

 Echinus esculentus, formation of, 511 



Anterior coelom, formation of, in embryo 

 of Antedon rosacea, 547 ; in larva of 

 Asterias, 468 ; in Balanoglossus davigerus, 

 571 ; in young Antarctic Gucwmaria, 

 542 ; in larva of Ophiothrix fragilis, 490 ; 

 in larva of Synapta digitata, 533 



Anterior endodermic thickening, formation 

 of, in embryo of Donacia, 253 



Anterior funnel fold in embryo of Loligo, 

 367 



Anterior mantle - groove of Terehratuhna 

 septentrionalis, 410 



Anterior mesenchyme cell in embryo of 

 Cynthia partita, 615 



Anterior mesoderm of Ascaris megdlocephala, 

 formation of, 444 



Anterior vacuolated crest of larva of Ophio- 

 thrix fragilis, 486 



Antero-dorsal arm of ciliated band of larva 

 of Asterias, 464 ; of larva of Echinocar- 

 dium cordatum, 522 ; of larva of Synapta 

 digitata, 633 ; of New England Tornaria, 

 576 



Antero-lateral arm of ciliated band of larva of 

 Ophiothrix fragilis, 489 



Antero-lateral rods of larva of Ophiothrix 

 fragilis, 487 



Anura, 657 



Anus, disappearance of, in larva of Ophio- 

 thrix fragilis, 495 ; formation of, in 

 Amphioxus lanceolatus, 592 ; in Astacus, 

 183, 185 ; in adult Asterias, 471 ; in larva 

 of Asterias, 461 ; in Balanoglossus clavi- 

 gems, 571 ; in Ciona intestinalis, 626 ; 

 in Crania, 414 ; in adult Echinus escu- 

 lentus, 520 ; in lAngula, 414 ; in Loligo, 

 358 ; in larva of Memtranipora, 390 ; in 

 Patella, 299 ; in Peripatus capensis, 171 ; 

 in larva of Phascolosoma, 377; in Poly- 

 gordius, 144 



Apical cells, formation of, in embryo of 

 Patella, 294 ; in embryo oi Phascolosoma, 

 374 ; in Planocera, 110 



Apical invagination of larva of Phylactolae- 

 mata, 395 



Apical organ of larva of Cyclostomata, 395 ; 

 of Cyphonautes larva, nature of, 392 ; of 

 embryo of Memtranipora, formation of, 

 388 



Apical plate, formation of, in embryo of 

 Antedon rosacea, 547; in larva of £fflfa?io- 

 glossus claiiigerus, 572 ; in Callidina rus- 

 seola, 423 ; in embryo of Dreissensia,, 

 337 ; in larva oi Echinus, 516 ; in larva of 

 Echiuroidea, 163; in embryo of Patella, 

 296 ; in embryo of Pedicellina, 399 ; in 

 larva of Terehratulina septentrionalis, 411 



Apical sense-organ, formation of, in Beriie, 

 94 ; in Cerebratulus lacteus, 120 



