INDEX 



Every reference is to the page : words in italics are names of genera or species ; 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 ; n. = note. 



A CANELLA, as host, 298 



Acanthobdellu, 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 5 chaetae, 360 



Acanthozoon, 20 



Accessory gut, of Polychaeta, 305 



Aceros, 19 



Achaeta, 445 



Achdoe, 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, 22 



Acyclus, 221 



Adaptation, of Trematodes, 52, 62 ; of 

 Cestodes, 74; of Nematodes, 161 



Adherent, 523 



Adinetn, 204, 222, 227 



Adventitious avicularia, 482 



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

 375 



Aetea, 5 IS, 525 



Agassiz, on Syllidae, 280 



Alaurina claparedil, 49 



Athertia, 204, 210, 213, 224, 227 



Alcinpe, 315 



Alciopids (Alciopina), 314 ; head, 263 ; 

 parapodium, 265 ; habit, 291 ; light- 

 organs, 294 



Alcwftiiui parasitica, 298 



AlcyuiuUa, 494, 505, 518 



Alcyonellea, 518 



Ale.ynHv.lium, 477, 480, 492, 518, 532: 



structure of zooecium, 469 ; reproduc- 

 tion, 507, 508 ; larva, 510, 611 



Alimentary canal see Digestive System 



Alitta, 317 



Allantonema, 131, 150, 161, 161 



Allman, on Polyzoa, 474, 475 



Alloeocoela, 43 ; habits, 46 ; reproduction, 

 47 ; classification, 50 



Alloiogenesis, 66 n. 



Alloloboplwra, 351, 367, 369, 371, 386, 

 389, 390 f. ; cocoons, 366 



Allostoma paUidum, 50 



Alluroides, 379 



Allurus, 351, 366, 370, 389 ; cocoons, 366 



Alma, 352 f., 387 



Alternation of generations, 66, 81, 281 



Amathia, 481, 518, 532 



Ammocharidae, 258, 325 



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 



Amphmnine, gill, 261 



Amphicorinidae, 258, 339 



Amphideis, 330 



Amphicteuidae, 258, 330 



Amphiglena, 273, 339 



Amphileptus, 235 



Amphilina, 91 



Ainphinvme, eye of, 255 ; A. snuiragdina, 

 colour, 293 



Amphinomidae, 258, ,?/.<?; shape, 259: 

 caruncle, 260, 273 u. ; head. 262, 263 ; 

 parapodium, 264 ; cirri, 265 ; chaetae, 

 267, 267 ; in Lcpas, 297 



Amihipn<ii, 102, 114 ; British species, 110 



Anijthijttyches, 77 



