INDEX. 



621 



Terebratula, 256, 272, 273, 274. 



Terebratulidce, 274, 277. 



Terebratulina, 274. 



Teredo, 286. 



Terguin, of the exoskeletou of Crustacea, 



194 ; of Arachnida, 221. 

 Terricola, 182 (see Oligochceta). 

 Termites, 244 ; communities of, 245. 

 Test, of Foraminifera, 50, 51 ; of Echin- 



oidea, 138, 142 ; of Tunicata, 266. 

 Testacella, 256, 296. 

 Testudinidce, 401. 

 Testudo, 401. 

 Tetrabranchiata (Cephalopoda), 304; 



characters of, 307 ; divisions of, 309 ; 



distribution of, in time, 314. 

 Tetranychus, 226. 

 Tetrao, 454. 

 Tetraonidce, 454. 

 Teuthidce, 306, 311, 315. 

 Thalassarctos, 535. 

 Thalassemacea, 179. 

 Thalassicolla, 59, 60. 

 Thalassicollida, 59. 

 Theca, 298, 313. 



Theca, of sclerodermic corallum, 115. 

 Thecaphora, 86, 88. 

 Thecididce, 274. 

 Thecidium, 274. 

 Thecod-ontia, 415. 

 Thecodontosaurus, 415. 

 Thecosomata, 298. 

 Thelyphonidce, 228. 

 Theriomorpha, 387 (see .4noi'a). 

 Thoracica (Cirripedia), 198, 203. 

 Thread-cells. 76. 

 Thread-worms, 169, 170. 

 Thylacinus, 497. 

 Thylacoleo, 562. 

 Thysanura, 242. 

 Ticks, 225, 226. 

 Tiger, 531, 539, 541. 

 Tipula, 247. 

 Toad, 390. 

 Tongue, of Insects, 236 ; of Gasteropoda, 



287 ; of Cephalopoda, 300 ; of Fishes, 



344 ; of Snakes, 403 ; of Lizards, 409 ; 



of Crocodile, 414; of Birds, 433, 434, 



440. 



Tornatella, 296. 

 Tornatellidce, 292, 296. 

 Torpedo, 374. 

 Tortoise Encrinite, 156. 

 Tortoises, 394, 395, 397, 401, 402. 

 Tortrix, 402. 

 Totipaimaice, 446. 

 Toucan, 457, 458. 

 Toxoceras, 310. 

 Toxodon, 493. 

 Tracheae, 223 ; of Arachnida, 223 ; of 



Myriapoda, 231 ; of Insecta, 238. 

 Trachearia (Arachnida), 224. 

 Trachyderma, 188. 

 Trachynema, 98. 

 Trachynemidce, 98. 

 Transformation, 33. 

 Trematis, 275. 

 Trematoda, 158 ; general characters of, 



164, 165 ; development of, 164 : habitat 



of, 164. 



Tremoctopus, 311 ; reproduction of, 302. 

 Triarthra, 175. 



Trichecidce, 532, 533. 



Trichecus, 533. 



Trichina, 170. 



Trichocysts, 71. 



Triconodon, 560, 562. 



Tridacna, 285. 



Tridacnidce, 284. 



Trigonia, 284. 



Trigoniadce, 283, 284. 



Trilobita, 198, 2u7; structure of the crust 

 of, 208 ; distribution of, in time, 220. 



Tringidce, 450. 



Trionycidce, 401, 402. 



Trionyx, 401. 



Triton (Mollusca), 294 ; (Amphibia), 387. 



Tritonia, 296. 



Tritoniadce, 292, 296. 



Trochilidce, 462. 



Trochoceras, 310, 312. 



Trochoid shell, of Foraminifera, 53 ; of 

 Gasteropoda, 289. 



Trochus, 295. 



Troglodytes, 462, 557. 



Trogontherium, 568 



Trophi, of Insects, 235, 236. 



Trophosome, 78. 



Truncated Shells, 257. 



Tube-feet of Echinus, 141; of Asteroidea, 

 145; of Ophiuroidea, 147 ; ofCrinoidea, 

 149 ; of Holothuroidea, 153. 



Tubicola, 181 ; characters of, 184 ; deve- 

 lopment of, 184 ; distribution of, in time 

 188. 



Tubifex, 183, 188. 



Tubiporidce, 120, 124. 



Tubularia, 81, 85. 



Tubularida, 81 (see Corynida). 



Tubulosa, 118, 134. 



Tunicata, 254, 255 ; characters of, 265 ; 

 respiratory process of, 268 ; circulation 

 of, 268 ; reproduction of, 268 ; homolo- 

 gies of, 269 ; divisions of, 270 ; distribu- 

 tion of, in space, 276 ; in time, 276. 



Tunics, of Ascidians, 266. 



Turbellaria, 158; characters of, 166; di- 

 visions of, 166. 



Turbinated Shells, 289. 



Turbinidce, 292, 295. 



Turbo, 295. 



Turkey, 454. 



Turrilites, 310, 311, 312, 315. 



Turritella, 291, 295. 



Turrit ellidce, 292, 295. 



Turtles, 398, 401. 



Tylenchus, 171. 



Tylodina, 296. 



Type, morphological, 14. 



UMBILICATED shell of Gasteropoda 290 



Umbo, 256, 279. 



Umbrella, 296. 



Umbrella of Lucernarida, 99. 



Ungulata, 484, 487; characters of, 511-513; 



divisions of, 513-526; distribution of, in 



time, 564-566. 

 Unto, 284. 

 Unionidce, 283, 284. 

 Univalve Shells, 256, 286, 289. 

 Upupidce, 462. 

 Uria, 445. 

 Uraster, 146. 

 Urnatella, 263. 



