558 



INDEX 



Tentacle-sheath, in Polyzoa, 470 



Tentacular cirri = Peristomial cirri, q.v. 



Tentacular filaments, 304 ; of Cirratulids 

 326, 327 



Terebella, 328 ; otocyst, 273 ; fossil, 301 

 T. conchilega, tube, 286, 287, 288 

 building of tube, 289, 290 ; gill, 329 

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

 gill, 329 



Terebellidae, 258, 327 ; shape, 259 ; ten- 

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

 gizzard, 271 ; tube, 286 ; use of tentacles, 

 289 ; colour, 293 ; phosphorescence, 296 ; 

 food of, 296 ; tube containing Polynoid, 

 298 



Terebellides, 299, 330 ; gill, 329 



Terebelliformia, 258, 325 ; definition, 304 

 genital organs, 273 ; gland shields, 287 

 nephridia, 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, 54 ; of Poly- 

 stomum, 57 ; of Cestodes, 75, 76, 86 

 see also Reproductive organs 



Tetragonurus, 389 



Tetraonchus, 73 



Tetraphyllidae, 91 



Tetrarhynchidae, 91 



Tetrarhynchus, 75, 76 n., 85, 91 



Tetrastemvui, 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 



Thalassemia, 411, 435 f., 44-1, 443 ; develop- 

 ment, 439 ; habits, 443 



Thelepus, 299, 329 



T/ieodisca, 321 



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



Thoracic membrane, 266, 305 



Thorax, of Polychaeta, 259, 306, 337 



Thysanosoina, 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 



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

 ducing organ, 296 ; prostomium, 259 ; 

 T. rolasi, 315 



Tooth, in Polyzoa, 482, 522 



Tortoise, Temnocephala associated with, 53 



Torus uncinigerus, 268 



Tracks, fossil, 302 



Travisia, 332 



Travisiopsis, 321 



Trematoda, 4, 51 f . ; life-histories, 7 J 



classification, 73 

 Trembley, on Turbellaria, 6 ; on Polyz 



496, 497 

 Trepostomata, 520 

 Triaenophorus ( = Tricuspidaria), 91 



cretory system, 84 

 Triarthra, 201, 203, 206, 211, 224, %'< 



226 

 Triarthridae, 200, 201, 202, 206, 207, ;?. 



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, 145 

 Trichochaeta, chaeta, 351 

 Trichoderma, 159 

 Trichoplax, 93, 95 



Trichosoma, 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 cinctd, 157 

 Tricuspidaria, 91 

 Trigaster, 359, 384 

 Trigonoporus, 19, 27 

 Trinephrus, 357, 382 f. 

 Triophthalmus, 224 

 Triphilus, 224 

 Tristicochaeta, 158 

 Tristomatidae, 53, 55, 73 

 Tristomatinae, 73 

 Tristomum, 73 

 Triticella, 478, 518, 533 

 Trocheta, 393, 407 

 Trochophore, 229 

 Trochopus, 73 



Trochosphaera, 200, 201, 221, 229, 230 

 Trochosphaeridae, 221 

 Trochosphere, of Archiannelida, 243, 245 ; 



of Polychaeta, 274, 275, 510, 512 ; of 



Echiuroidea, 439, 510 ; of Polyzoa, 510 

 Trochus, in Rotifers, 202, 204 

 Trophi, of Rotifers, 209, 210 

 Trophonia, 299, 334 5 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 Clymene, 287 ; 



of Dodecaceria, 326 ; of Eunice tibia na, 



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



Haplobranchus, 339; of . HehcUerdbran- 



chus, 326 ; of Hyalinoecia, 290, 319 ; of 



Maldanidae, 332 ; oiMyxicola, 285, 338 ; 



of Nereis, 316 ; of Nicomache, 287 ; of 



Onuphis, 287, 319 ; of Owenia, 325 ; of 



