INDEX. 



595 



Ajilysioidea, 407. 

 Apodina, 311. 

 Apolemia, 152. 

 Apoleino])sis, 152. 

 Apomatus, 491. 

 Apopyle, 77. 

 Aporosa, 19:}, 194. 

 Aporrhais, 400. 

 Apple-snail, 399. 

 Apsilus, 300, 307. 

 Aptychus, 444. 

 Aquiferous canals, 321 ; 



pore, 357. 

 Arabella, 481. 

 Arachnactis, 100, 190. 

 Area, 331, 333, 334, 336, 



345. 



Arcacea, 345. 

 Arachnidiura, 567. 

 Arcella, 11, 12. 

 Archaediscus, 15. 

 Archaeobdella, 526. 

 Archespore. 60. 

 Archiaunelida, 451. 

 Archigetes, 244, 256. 

 Arcliirhiza, 167. 

 Archit'-uthis, 417, 445. 

 Arcidae, 328, 341. 

 Arcyria, 17. 

 Area, 325. 

 Arenicola, 459,461, 463, 



465, 488. 

 Are th usa, 156. 

 Argiopo, 576, 581, 585. 

 Argouauta, 420, 437, 



440, 441, 446. 

 Arhynchus, 296, 297. 

 Aricia, 463, 467, 482. 

 Aricidea, 482. 

 Arion, 379, 416. 

 Arippasa, 491. 

 Aristenia, 480. 

 Arniandia, 487. 

 Armed calaniary, 445. 

 Armenista, 144. 

 Arnula, 52, 53. 

 Artamaceae, 486. 

 Artemisina, 96. 

 Artieulata, 566. 

 Artiscus, 23. 

 A>caris, 276, 277, 283. 

 Ascoglena, 31. 

 Ascoglossa, 413. 

 Ascon, 75. 

 Asconeuia, 92. 

 Asconidae, 89, 

 Asexual reproduction, 7 1 , 



218, 221 ; medusae, 



118; ooelcnterata, 120; 



polychaeta, 468 ; oligo- 



chaeta, 507. 



Aspergillmn, 327, 349. 



Aspidisi-a, 49. 



Aspidobranchiata, 393. 



Aspidocephalus, 284. 



Aspidocotyle, 238. 



Aspidocotylea, 236. 



Aspidogaster, 232, 237. 



Aspidosiphon, 539. 



Aspidostoma, 566. 



Aspirotricha, 46. 



Asplancliua, 303, 309. 



Assiminea, 398. 



Astacobdella, 509. 



Astartidae, 328, 347. 



Asterope, 479. 



Asteropus, 97. 



Asterosniilia, 195. 



Astraeopora, 197. 



Astrangia, 195. 



Astrella, 94. 



Astasia, 31. 



Astasiopsis, 31. 



Aster, 85. 



Astrocoenia, 196. 



Astroides, 197. 



Astroloiiche, 23. 



Astrolophus, 23. 



Astropeplus, 95. 



Astrophora, 94. 



Astrorbiza, 13. 



Astylozoon, 51. 



Astylus, 129. 



Asymmetry of Gastro- 

 poda, 383, 385. 



Athoracophorus, 416. 



Athoralia, 152. 



Athoria, 152. 



Athorybia, 153. 



Atlanta, 401, 402. 



Atoll, 173. 



Atolla, 167. 



Atopos, 416. 



Atractylis, 130. 



Atretia, 585 



Atrium genitale, 215 ; of 

 Oligochaeta, 505. 



Atrocha, 474. 



Attractonema, 282, 291. 



Atys, 406. 



Auditory organs, Medu- 

 sae, 115. 



Audouinia, 485. 



Auger-shell, 397. 



Aulacantha, 24. 



Aulactinia, 187. 



Aulactinium, 24. 



Aulascus, 92 



Aulastoma, 516, 527. 



Auleua, 97. 



Aulocalyx, 92. 



Aulochone, 92. 



Aulocystis, 93. 

 Aulorchis, 188. 

 Auralia, 154. 

 Aurelia, 109, 167. 

 Aureliana, 186. 

 Auricle of Ctenophora, 



202. 



Auricula, 414, 415. 

 Auronectae, 153. 

 Aurophore, 153. 

 Aurophysa, 155. 

 Aurora, 94. 

 Aurosa, 167. 

 Autolytus, 467, 470, 



476. 



Automolos, 220. 

 Autozooids, 177. 

 Avenella, 567. 

 Avic. = avicularia. 

 Avicula, 331, 336, 341, 



346. 



Avicularia, 553. 

 Axifera, 182. 

 Axine, 236. 

 Axiuella, 96. 

 Axinus, 347. 

 Axiothea, 488. 

 Axoniderma, 96. 

 Azorica, 95. 

 Azygobrancliiate, 395. 

 Azygoplon, 133. 



Babesia, 63. 

 Bacillus, 86. 

 Badhamia, 17. 

 Bajulus, 93. 

 Balanites, 92. 

 Balanopliyllia, 196. 

 Balantidiopsis, 48. 

 Balantidium, 48. 

 Balea, 416. 

 Balladina, 49. 

 Barathrobius, 179. 

 Barrier reef, 172. 

 Barroussia, 61. 

 Barylielia, 195. 

 Basal plate, coral, 192. 

 Basommatophora, 415. 

 Bassia. 149 

 Bathelia, 195. 

 Bath sponge, 98. 

 Bathyactis, 196. 

 Bathyanthus, 190. 

 Bathybius, 11. 

 Bathycodon, 131. 

 Bathydorus, 92. 

 Bathygorgia, 182. 

 Bathypathes, 191. 

 Bathyphysa, 153. 

 Bathyptilum, 181. 

 Batrachobdella, 526. 



