SUBJECTS INDEX. 



Acanthobothridae, 199. 

 Acaathocephala, 219. 

 Accela, 159, 172, 175. 

 Actinaria, 100. 

 Actinia aurautiaca, 89. 



equina, 89. 



meserabryanthemum, 89. 



parasitica, 88. 

 Actinula, 39, 51, 52. 

 Adamsia Roudeletii, 88. 



diapbana, 91. 

 Jilginidfe, 51. 

 JEginopsis, 57. 

 JSquorea, 40. 

 Agalma, 64. 

 Agalmidse, 69. 

 Agalmopsis (Fig. 28), 66. 

 Aglaura, 57. 

 Alciopidffi, eyes of, 289, 

 Alcyonaria, 75, 78, 82. 

 Alcyonium, 76, 83. 

 Allantonenia, 211. 

 AUoiocoela, 159. 

 Alophota (Fig. 25), 62. 

 Alternation of generations, 2. 

 Amnion (Pilidium), 221. 

 Amorpbina, 21. 

 Ampbiblastula, 14, 17, 20. 

 Amphilina, 199, 200. 

 Ampbiporus, 228. 

 Amphiptycbes, 199. 

 Ampbitrite (Fig. 138), 298. 

 Ampbitrochse, 271, 278. 

 Ampbiura, enterobydrocoele of, 



413. 

 Ampbiura squamata, 404. 

 Anguillula, 242. 

 Animal pole, see Pole, animal. 

 Annelida, 262. 



relationships of, 341. 

 Antedou, 404. 



larva of, 415, 457. 



mesencbyma of, 450. 



pentacrinoid stage of, 443. 



vasoperitoneal vesicle of, 412. 



Antbozoa, 39, 75. 

 Apbanostoma diversieolor, 175. 



pulchella, 175. 

 Aphidse, sexual cells of, 12. 

 Apolemia, 67. 

 Apolemidse, 75. 

 Aracbnactis, 98. 

 Arbacia, Pluteus of, 425. 



pedicellaria of, 440. 

 Arebenteric cavity, 4. 

 Arcbiannelida, 261, 347. 

 Arcbiblastula, see Cceloblastula, 

 Archigetes, 199, 200. 

 Arcbibydra, 125. 

 Arenicola, 277, 278. 

 Aricia, 363. 

 Ascandra contorta, 20. 



Lieberkiibnii, 20. 

 Ascaris lumbricoides, 234. 



megalocepbala, 234, 235. 



nigrovenosa, 236. 



sexual cells of, 12. 

 Ascetta, 22, 28. 



Asteracantbion Miilleri, enteroby- 

 drocoele of, 407. 



larval appendages of, 422. 



tenuispinus, reproduction by 

 division in, 456. 

 Asterina, 421. 



dorsal pore and stone canal 

 of, 436. 



enterocoele of, 406. 



enterobydrocoele of, 414. 



intestine of, 435. 



metamorpbosis of, 436. 



nervous system of, 436. 



stomodseum of, 403. 



vasoperitoneal vesicle of, 407. 

 Asteroidea, 419, 432. 



mesencbyma of, 400. 

 Astrseacea, 101, 

 Astroides, 98. 

 Astropecten, mesencbyma of, 402, 



456. 

 Atokal forms of Nereidse, 303. 



467 



