558 



INDEX 



Tentacle-sheath, in Polyzoa, 470 



Tentacular cirri = Peristomial cirri, q.v. 



Tentacular filaments, 304 ; of Cirratulids, 

 326, 327 



TerebeUa, 328 ; otocyst, 273 ; fossil, 301 

 T. conchilega, tube, 286, 287, 288 

 building of tube, 289, 290 ; gill, 329 

 T. nebulosa, colour, 292; as host, 311 

 gill, 329 



Terebellidae, 258, 327 ; shape, 259 ; ten 

 tacles, 263 ; gill, 265 ; chaetae, 266, 267 

 gizzard, 271 ; tube, 2S6 ; use of tentacles 

 289 ; colour, 293 ; phosphorescence, 296 

 food of, 296 ; tube containing Polynoid 

 298 



TerebeUides, 299, 830 ; gill, 329 



Terebelliformia, 258, 325 ; definition, 304 

 genital organs, 273 ; gland shields, 287 

 uephridia, 269 ; nuchal organs, 273 ; 

 uncini, 266, 267; vascular system, 252 



Terebripora, 478 



Terricola, 30, 42 



Tertiary, Polyzoa, 521 



Tessin, on Rotifers, 198, 218 



Testes, of Leptoplana, 14, 15 ; of Planaria 

 lactea, 38, 39 ; of Acoela and Alloeo- 

 coela, 47 ; of Temnocephala, 64 ; of Poly- 

 stomum, 57 ; of Cestodes, 76, 76, 86 

 see also Reproductive organs 



Tetragonurus, 389 



Tetraonchus, 73 



Tetraphyllidae, 91 



Tetrarhynchidae, 91 



Tetrarhynchus, 75, 76 n., 85, 91 



Tetrastemma, British species, 110 ; land 

 forms, 101, 115, 118 ; fresh-water forms, 

 101, 118 ; excretory system, 108, 109 ; 

 habits, 114 ; hermaphrodite species, 109 ; 

 viviparous species, 117 



Thalamoporella, 530 



Thalassema, 411, 435 f., 441, 443 ; develop- 

 ment, 439 ; habits, 443 



Thelepus, 299, 329 



Tlieodism, 321 



Thompson, J. V., on term Polyzoa, 475 



Thoracic membrane, 266, 305 



Thorax, of Polychaeta, 259, 306, 337 



Thysanosoma, 91 ; generic characters, 90 ; 

 T. fimbriata, life-history, 83 ; specific 

 characters, 90 ; T. giardii, specific char- 

 acters, 90 



Thysanozoon, 13, 18, 19, 20 



Tomopteridae, 258, 291, 315 



Tumopteris, 315 ; colour, 294 ; light-pro- 

 ducing organ, 296 ; prostomium, 259 ; 

 T. rolasi, 318 



Tooth, in Polyzoa, 482, 622 



Tortoise, Temnocephula associated with, 53 



Torus uncinigerus, 268 



Tracks, fossil, 302 



Tnirisia, 332 



Travisiupsis, 321 



Trematoda, 4, 51 f. ; life-histories, 71 ; 

 classification, 73 



Trembley, on Turbellaria, 6 ; on Polyzoa, 

 496, 497 



Trepostomata, 520 



Triaenophorus (Tricuspidaria), 91 ; ex- 

 cretory system, 84 



Triarthra, 201, 203, 206, 211, 224, 225, 

 226 



Triarthridae, 200, 201, 202, 206, 207, 824, 

 226 



Trias, Serpulid in, 301 



Trichina, 131, 135, 144, 161 ; T. spiralis, 

 146, 163 



Trichinosis, 82, 146, 147 



Trichocephalus, 131, 135, 136, 144, 160, 

 163 ; species of, 145 ; T. dispar, 146 



Trichochaeta, chaeta, 361 



Trichoderma, 159 



Trichoplax, 93, 95 



Trickosoma, 144, 163 ; species of, 145 



Trichotrachelidae, 144 



Tricladida, 7, 30 f. ; habits, 35 f. ; sexual 

 reproduction, 38 ; asexual reproduction, 

 40 ; classification, 42 ; British species, 

 31, 32, 34, 42 



Tricoma cincta, 157 



Tricuspidaria, 91 



Trigaster, 359, 384 



Trigonoporus, 19, 27 



Trinephrus, 357, 382 f. 



Triophthalmus, 224 



Triphilus, 224 



Tristicochaeta, 168 



Tristomatidae, 53, 55, 73 



Tristomatinae, 73 



Tristomum, 73 



Triticella, 478, 518, 533 



Trocheta, 393, 407 



Trochophore, 229 



Trochopns, 73 



Trockosphaera, 200, 201, 221, 229, 230 



Trochosphaeridae, 221 



Trochosphere, of Archiannelida, 243, 245 : 

 of Polychaeta, 274, 276, 510, 512 ; of 

 Echiuroidea, 439, 510 ; of Polyzoa, 510 



Trochus, in Rotifers, 202, 204 



Trophi, of Rotifers, 209, 210 



Trophonia, 299, 334 ', genital organs, 273 ; 

 head, 262 ; intestine, 271 



Trunk, of Nereis, 246 ; of Polychaeta, 

 259 ; of Gephyrea, 412 f. 



Tube, of Rotifers, 205 ; of Polychaeta, 287 

 f. ; composition of, 290 ; fossil, 301, 302 ; 

 of Chaetopterus, 323 ; of Clymoie, 287 ; 

 of Dodecaceria, 326 ; of Eunice tibiana, 

 290 ; of Eunicidae, 285, 290, 318 ; of 

 Haplobranchus, 339 ; of Heknterubmn- 

 chus, 326 ; of Hyalitioecia, 290, 319 ; of 

 Maldanidae, 332 ; oUfyxicola, 285, 338 ; 

 of Nereis, 316 ; of Nicomaclie, 287 ; of 

 Omiphis, 287, 319 ; of Choenia, 325 ; of 



