SUBJECTS INDEX. 



Acanthobothridae, 199. 

 Acaathocephala, 249. 

 Acoela, 159, 172, 175. 

 Actinaria, 100. 

 Actinia aurantiaca, 89. 



equina, 89. 



mesenibryanthemum, 89. 



parasitica, 88. 

 Actinula, 39, 51, 52. 

 Adamsia Eondeletii, 88. 



diaphana, 91. 

 ^ginidse, 51. 

 ^ginopsis, 57. 

 jEquorea, 40. 

 Agalma, 64. 

 Agalmidae, 69. 

 Agalmopsis (Fig. 28), 66. 

 Aglaura, 57. 

 Alciopidae, eyes of, 289. 

 Alcyonaria, 75, 78, 82. 

 Alcyonium, 76, 83. 

 Allantoneraa, 241. 

 Alloiocoela, 159. 

 Alophota (Fig. 25), 62. 

 Alternation of generations, 2. 

 Amnion (Piiidium), 221. 

 Amorphina, 24. 

 Amphiblastula, 14, 17, 20. 

 Araphilina, 199, 200. 

 Amphiporus, 228. 

 Amphiptyches, 199. 

 Amphitrite (Fig. 138), 298. 

 Amphitrochee, 271, 278. 

 Ampbiura, enterobydrocoele of, 



413. 

 Amphiura squamata, 404. 

 Anguillula, 242. 

 Animal pole, see Pole, animal. 

 Annelida, 262. 



relationships of, 341. 

 Antedon, 404. 



larva of, 415, 457. 



mesenchyma of, 450. 



pentacrinoid stage of, 443. 



vasoperitoneal vesicle of, 412. 



Antbozoa, 39, 75. 

 Apbanostoma diversicolor, 175. 



pulchella, 175. 

 ApbidsB, sexual cells of, 12. 

 Apolemia, 67. 

 Apolemidse, 75. 

 Aracbnactis, 98. 

 Arbacia, Pluteus of, 425. 



pedicellaria of, 440. 

 Arcbenteric cavity, 4. 

 Archiannelida, 261, 347. 

 Arcbiblastula, see Coeloblastula. 

 Arcbigetes, 199, 200. 

 Arcbibydra, 125. 

 Arenioola, 277, 278. 

 Aricia, 363. 

 Ascandra contorta, 20. 



Lieberkiihnii, 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. 



stomodsBum of, 403. 



vasoperitoneal vesicle of, 407. 

 Asteroidea, 419, 432. 



mesenchyma of, 400. 

 AstrEeacea, 101. 

 Astroides, 98. 

 Astropecten, mesenchyma of, 402, 



456. 

 Atokal forms of Nereidae, 303. 



467 



