INDEX 



Every reference is to the page : words in italics are names of genera or specie* ; figures 

 in italics indicate that the reference relates to systematic position ; figures in thick 



type refer to an illustration ; f. = and in following page or pages ; u. = note. 



ACANELLA, as host, 298 



Acanthobddla, 395 



Acanthocephala, 123, 124, 174 f. ; embry- 

 ology, 179 ; classification, 181 



Acanthocotyle, 73 



Acanthodrilidae, 357, 362, 381, 383, 384 



Acanthodrilus, 356, 363, 366, 372, 382, 

 384 ; chaetae, 350 



Acqfiithozoon, 20 



Accessory gut, of Polychaeta, 305 



Acer os, 19 



Achaeta, 445 



Acholoe, 297 



Aciculum, 247 ; fossil, 302 



Acmostoma, 50 



Acoela, 42 ; occurrence and habits, 43 ; | 

 reproduction, 47 ; classification, 49 



Acotylea, 16 f., 17, 18 



Acrorhynchus, 49; occurrence, 44 



Actinotrocha larva, 458 



Actinurus, 201, 222 



Acyclus, 221 



Adaptation, of Trematodes, 52, 62 ; of 

 Cestodes, 74; of Nematodes, 161 



Adherent, 523 



Adineta, 204, 222, 227 



Adventitious avicularia, 482 



Aeolosoma, 349, 353, 354, 360, 370, 374, 

 375 



Aetea, 518, 525 



Agassiz, on Syllidae, 280 



Alaurina claparedii, 49 



Albertia, 204, 210, 213, 224, 227 



Alciope, 315 



Alciopids (Alciopina), 314 ; head, 263 ; 

 parapodium, 265 ; habit, 291 ; light- 

 organs, 294 



Alciopina parasitica, 298 



AlcyoneUa, 494, 505, 518 



Alcyonellea, 518 



Alcyonidium, 477, 480, 492, 518, 532 : 



structure of zooecium, 469 ; reproduc- 

 tion, 507, 508 ; larva, 510, 511 



Alimentary canal see Digestive System 



Alitta, 317 



Allantonema, 131, 150, 151, 161 



Allman, on Polyzoa, 474, 475 



Alloeocoela, 43 ; habits, 46 ; reproduction, 

 47 ; classification, 50 



Alloiogenesis, 66 n. 



Allolobophora, 351, 367, 369, 371, 386, 

 389, 390 f. ; cocoons, 365 



Allostoma pallidum. 50 



Allnroides, 379 



Alhcrus, 351, 366, 370, 389 ; cocoons, 365 



Alma, 352 f., 387 



Alternation of generations, Q6, 81, 281 



Amathia, 481, 518, 532 



Ammocharidae, 25S. '>.''> 



Ammotrypane, 273,331; intestine, 271 



Ampharete, 330 



Ampharetidae, 258, 330 



Amphibia, Trematodes of, 55, 62, 71. 72; 

 Nematodes of, 163 



Amphichaeta, 377 



Amphicoerus, 49 



Amphicora, 339 



Amphicorine, gill, 261 



Amphicorinidae, 258, 339 



Amphicteis, 330 



Amphictenidae, 258. 330 



Amphiglena, 278, 339 



AmphUeptus, 235 



.1 mphilinu, 91 



Amphinome, eye of, 255 ; A. smarqgdina, 

 colour, 293 



Amphinomi.l. 18 : shape, 



caruncle, 260, 273 n. : head, 262. 268 ; 

 parapodium, 264 ; cirri, 265 : chaetae, 

 267, 267 ; in Lquu, 297 



Amphiporus, 102, 114 ; British specie.-, 110 



Amphiptyches, 77 



