SUBJECTS INDEX. 



Acauthobothridas, 199. 

 Acaathocephala, 219. 

 Accela, 159, 172, 175. 

 Actinaria, 100. 

 Actinia auraotiaca, 89. 



equina, 89. 



meserabryanthemutn, 89. 



parasitica, 88. 

 Actiiiula, 39, 51, 52. 

 Adamsia Roudeletii, 88. 



diaphana, 91. 

 J3giuid£e, 51. 

 .^Eginopsis, 57. 

 iEquorea, 40. 

 Agalma, 64. 

 AgalmidsB, 69. 

 Agalmopsis (Fig. 28), 66. 

 Aglanra, 57. 

 AlciopidiB, eyes of, 289. 

 Alcyonaria, 75, 78, 82. 

 Alcyonium, 76, 83. 

 Allantoneraa, 241. 

 Alloioccela, 159. 

 Alophota (Fig. 25), 62. 

 Alternation of generations, 2. 

 Amnion (Pilidium), 221. 

 Aniorphina, 24. 

 Amphiblastula, 14, 17, 20. 

 Amphilina, 199, 200. 

 Amphiporus, 228. 

 Amphiptyches, 199. 

 Amphitnte (Fig. 138), 298. 

 Amphitrochffi, 271, 278. 

 Amphiura, enterohydrocoele of, 



413. 

 Amphiura squamata, 404. 

 Anguillula, 212. 

 Animal pole, see Pole, animal. 

 Annelida, 262. 



relationships of, 341. 

 Antedon, 404. 



larva of, 415, 457. 



meseachyma of, 450. 



pentacrinoid stage of, 443. 



vasoperitoaeal vesicle of, 412. 



Anthozoa, 39, 75. 

 Aphauostoma diversicolor, 175. 



pulchella, 175. 

 Aphidfe, sexual cells of, 12. 

 Apolemia, 67. 

 Apolemidae, 75. 

 Arachnactis, 98. 

 Arbacia, Pluteus of, 425. 



pedicellaria of, 440. 

 Archenteric cavity, 4. 

 Archiannelida, 261, 347. 

 Avchiblastula, see Cteloblastula. 

 Archigetes, 199, 200. 

 Archihydra, 125. 

 Arenicola, 277, 278. 

 Aricia, 363. 

 Ascandra contorta, 20. 



Lieberkttbnii, 20. 

 Ascaris lumbricoides, 234. 



megalocephala, 234, 235. 



nigrovenosa, 236. 



sexual cells of, 12. 

 Ascetta, 22, 28. 



Asteracanthion Miilleri, enterohy- 

 drocoele of, 407. 



larval appendages of, 422. 



tenuispinus, reproduction by 

 division in, 4-56. 

 Asterina, 421. 



dorsal pore and stone canal 

 of, 436. 



enterocoele of, 406. 



enterohydroccele of, 414. 



intestine of, 435. 



metamorphosis of, 436. 



nervous system of, 436. 



stomodseum of, 403. 



vasoperitoneal vesicle of, 407. 

 Asteroidea, 419, 432. 



mesenchyma of, 400. 

 Astrffiacea, 101. 

 Astroides, 98. 

 Astropecten, mesenchyma of, 402, 



456. 

 Atokal forms of Nereidae, 303. 



