INDEX. 



6/3 



ThalassicoUa, 62, 63. 



Thalassieollida, 6i. 



Theca, 321, 337. 



Thfica, of sclorodermic corallain, 120. 



Tliecaphora, 90, 93. 



Thecidx, 139. 



Thecididts, 296. 



Theiyidium, 296. 



Tlieoodontia, 44.5. 



rAecodonfosaurtts, 445. 



Thecosomata, 321. 



ThelyphonidcB, 242. 



Theriomorpha, 413 (see jlnoura). 



ThoracuM (Cirripedia), 214 



Thread-oellsi 78, ,S0. 



Tliread-wornia, 176, 177. 



Thyiacinus, 536. 



Thylacoleo, 611. 



Thysanura,, 2.58. 



Ticks, 239, 240. 



Tiger, 683, 685. 



mj)«i(»f265. 



TipuKdce, 264, 265. 



Toad, 416. 



Tongue, of Insects, 251 ; of Gasteropoda^ 



S09 ; of Cephalopoda, 323 ; of Pislies, 



306; of Snalies, 429 ; of Liznrds, 437; of 



Crocodile, 443 ; of Birds, 404, 471. 

 Tomatella, 318. 

 Tomatellidce, 314, 318. 

 Torpedo, 398. 

 Tortoise Encrinite, 163. 

 Tortoises, 420, 421, 423, 427, 428. 

 ToHrix. 428. 

 Totmms, 483. 

 Totvpahnatoe, 477. 

 Toucan, 494. 

 . Toxoceras, 333, 334. 

 Toxodon, 531. 

 Tracheae, 200; of Arachnida, 237; of 



Myriapoda, 245 ; ■ of Insecta, 253. 

 Trac7iea/ria (Arachnida), 238. 

 Trachyderma, 198. 

 Trachynema, 103. 

 Traehynemidce, 103; 110. 

 TragvXus, 562. . 

 Transformation, 35. 

 Trematis. 297. 

 rrem«(o(Za, 165 ; general characters of, 



171, 172; development of, 172; habitat 



of, 173. 

 Tremoctopus, 335 ; reproduction of, 326. 

 I'riarthra, 183. 

 TriaheeidoB, 675, 676. 

 Tricliecus, 576. 

 Triahina, 177. 

 Triohocysta, 75. 

 Trichoglosmis, 494. 

 Trichoptera, 261. 

 Trwonodmi. 608, 610. 

 rrMJaenffl, 307. 

 rrMocJiidcB, 306, 307. 

 Trigonia, 306. 

 Trigoniadce, SOS, 306. 

 Trilobita, 219 ; structure of the crust of, 



220 ; distribution of, in time, 234. 

 Trimera, 273. 

 Trmgidae, 483. 

 Trionyeidce, 427, 423. 

 Trionyx, 427. 



V'rifoji (^Mollueca), 317 ; (4mpM6ia), 413. 

 ZVaoniffi, 319. 



Trilonicxke, 814, 319. 



I'rocAiluiis, 499. 



Trochoeeras, 333, 335. 



Trochocystites, 164. 



Trochoid, shell, of Ji'oramini/em, 56 ; ol 

 &it8ter<)2»u{a, 312. 



Trochui, 3U. 



Troglodytes, 499. 



Trogon, 495. , 



TrogomSte, 493, 495. 



Trogontherium, 617. 



Tromtitiicifle, 241. 



Trophi, of Insects, 250. 



Trophosome, 82. 



Truncated Shells, 278. 



Trygon, 399. 



Tube-feet, of .BcRmiw, 147 ; of ^sf«m(tea, 

 162; of Ophiivroidea, 154; otCrinoidea, 

 165; ot Holothuroidea, 161. 



TitSicoJa," 189 ; characters of, 192, 193 ; 

 development of, 193 ; distribution of, in 

 time, 197. 



TuWex, 192, 198. 



TvMporidte, 126, 126, 133. 



Tubularia, 86, 89. 



TufeuZorida, 85 (see Corynidd). 



Tubulosa, 123, 139, 140. 



Tunicata, 275, 276 ; characters of, 287 ; 

 respiratory process of, 2S9 ; circulation 

 of, 289; reproduction of, 290; homo- 

 logies of, 291 ; divisions of, 291 ; dis- 

 tribution of, in space, 297 ; in time 

 298. 



Tunics, of Ascldians, 287. 



Tupaia, 697. 



Turbeliaria, 165 ; characters of, 173 ' 

 divisions of, 174. 



Turbinated Shells, 312. 



TurtinidcB, 314, 318. 



Turbinolidce, 140. 



Turbo, 318. 



Turkey, 489. 



Turrimeg, 333, 334, 336, 338. 



Turritella. 314, 318. 



Turritellidce, 313, 318. 



Turtles, 423, 426, 427. 



Tylenchits, 179. 



Tylodina, 319. 



Type, morphological, 15. 



Umeilicated shell of Gasteropoda, 312. 



Umbo, 301. 



Umbrella, 319. 



Umbrella of Lucemarida, 104, lOS. 



XTngulata, 613, 522, 525; charaotera of, 



661 ; divisions of, 562 ; distribution of, 



in time, 613. 

 Vnio, 306. 

 Uniomdae, 305, 306. 

 Univalve Shells, 277, 308, 311. 

 XTpupidce, 499. 

 Uria, 476. 

 Uraster, 164. 

 Umdtella, 284. 



Urodela, 407 ; characters of, 410. 

 Ursidce, 577. 

 Vrsus, 678, 616. 

 Crus, 615. 



Vacttoles, of Protozoa, M ; ol Infusoria, 



71. 

 Vaginicola, 75. 



