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. 

 Thalassfcollida, 59. 

 Theca, 298, 313. 



Theca, of sclerodermic corallum, 115. 

 Thecaphora, 86, 88. 

 Thecididce, 274. 

 Thecidium, 274. 

 Thecodontia, 415. 

 Thecodontosaurus, 415. 

 Thecosomata, 298. 

 Thelyphonidce, 228. 

 Theriomorpha, 387 (see .4owra). 

 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. 

 Totipatmatce, 446. 

 Toucan, 457, 458. 

 Toxocerds, 310. 

 Toxodon, 493. 

 Tracheae, 223 ; of Arachnida, 223 ; of 



Myriapoda, 231 ; of Insecta, 288. 

 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. 



Turkey, 454. 



Turrilites, 310, 311, 312, 315. 



Turritella, 291, 295. 



Turritellidce, 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. 

 tfmo, 284. 

 Unionidce, 283, 284. 

 Univalve Shells, 256, 286, 289. 

 Upupidce, 462. 

 tTrwi, 445. 

 Uraster, 146. 

 Urnatella, 263. 



