INDEX 



Abdomen of original Crustacea, function of, 



212 

 Abdominal appendages of Astacus, 188 ; 



of caterpillar larva, 286 ; of embryo of 



Blatta, 262 ; of embryo of Donacia, 252 ; 



in embryos of Hymenoptera, 266 ; in 



embryos of Lepidoptera, 266 ; of embryo 



of Liymdus, 237 ; of Machilis, 265 ; of 



embryo of Melolontha, 266 ; of embryo of 



scorpion, 240 

 Abdominal region of embryo of Donacia, 



251 

 Aboral coelom of Antedon rosacea^ 552 

 Aboral disc of fixed larva of Asterias, 



470 

 Aboral nervous system of Antedon rosacea, 



formation of, 557 

 Aboral sinus, formation of, in Amphiura 



squamata, 501 ; in Asterina gibbosa, 481 ; 



in Echinus esculentits, 520 

 Aboral spike of l^rva of Echinocardium 



cordatum, 522 

 Aboral tentacles of Tvimlaria, formation 



of, 55 

 Acanthobdellidae, 128 

 Acarina, 221 ; development of, 242 

 Accessory adductor muscle of Cyphonautea 



larva, 393 

 Accessory retractor muscles of larva of 



Phascolosoma, 376 

 Achromatic spindle, appearance of, 6 

 Achtheres amblqplitis, 649, 651 ; development 



of, 205-208 

 Aanaea, 300, 317, 320 ; metamorphosis of 



larva of, 306 

 Acoelida, 102, 103 

 Acron segment of Donacia, 252 ; of Insecta, 



282 

 Acrosome of spermatozoon, definition of, 7 

 Actinia bermitdensis, development of, 84 

 Actinia equina, development of, 83, 84 

 Actinosphaerium, 170 

 Actinotrocha larva of Phoronis, structure of, 



381, 382 

 Aotinozoa, 53, 166, 661 ; development of, 



76-87 ; development compared with that 



of Ctenophora, 96 

 Actinula larva of Tttitdaria, 56 

 Adamsia paUiata, 85 



Adambulacral plates of Amphiura squamata, 



formation of, 499 

 Adductor muscle of adult Unio, formation 



of, 353 

 Adductor muscle of Cyphonautes larva, 393 

 Adoral ciliated band of larva of Asterias, 



formation of, 462 ; function of, 463 ; of 



larva of Ophiothrix fragilis, 487 ; of larva 



of Synapta digitata, 532 

 Adradial cushion of larva of Aurelia, 92 

 Affinities of Amphiorus with Enteropneusta, 



605-608 

 Affinities of the Enteropneusta, 584-586 

 Agaricia, larva of, 84 

 Agelena, development of, 221-236 

 Agelena labyrinthica, 221 

 Alcyonaria, 53, 76, 83 ; development of, 86- 



88 ; digestion of, 81, 82 ; formation of 



skeleton of, 88 

 Alcyonidium, development of bud of, 398 

 Alcyonidium albidum, 394 

 Alcyonidium polyoum, larva of, 395 

 Alcyonium, 86 

 Alecithal egg of Amphioxus lanceolatus, 



687 

 Alima larva of Stomatopoda, 218 

 Alimentary canal of Bugula, formation of, in 



bud, 397 

 AUoiocoelida, 102, 103 

 Alternation of generations in Hydrozoa, 64 ; 



in Polyzoa ectoprocta, 396 ; in Spongilla 



lacustris, 50 

 Alveoli of Echinus esculentus, 520 

 Amhloplitis rupestris, 206 

 Ambulacral plates of Asterina gibbosa, origin 



of, 478 

 Ambulatory legs of Astacus, 188 

 Amnion, formation of, in embryo of Donacia, 



249 ; in Doryphora, 261 ; in larva of 



Echinus esculentus, 514; in embryo of 



Lepisina, 265; in embryo of Machilis, 



265 ; embryo of scorpion, 240 

 Amniotic fold in larva of Polygordius lacteus, 



151 

 Amniotic invagination, formation of, in larva 



of Echinus esculentus, 512 

 Amniotic invaginations in Pilidium larva of 



Nemertinea, 122 

 Amodia, 27 



667 



