INDEX. 



8 45 



Ticks, 321, 322. 

 Tiger, 750. 

 Tiger-beetle, 362. 

 Tillodontia, 725. 

 Tillotheridce, 725. 

 Tillotherium, 725, 726. 

 ThiamidcK, 615. 

 Tinainomorphce, 578. 

 Tinamou, 578, 615. 

 Tinoceras, 725. 

 Tipula, 354. 

 Tipulidce, 354, 355. 

 Titatiotherium, 699. 

 Titmice, 627. 

 Toad, 521, 522. 

 Tomopteris, 271. 



Tongue, of Insects, 337 ; of Gasteropoda, 

 407 ; of Cephalopoda, 421 ; of Fishes, 

 465 ; of Snakes, 538 ; of Lizards, 547 ; of 

 Crocodile, 557 ; of Birds, 584. 

 Tooth-shells, 412. 

 Top-shells, 412. 

 Tornaria, 241. 

 Tornatellidce, 412. 

 Torpedo, 499. 

 Tortoise Enerinite, 223. 

 Tortoises, 527, 528, 530, 536. 

 Tortrix, 537. 

 Totanus, 611. 

 Totipalmatce, 604. 

 Toucan, 621, 622. 

 Touracos, 622. 

 Toxoceras, 434, 435. 

 Toxodon, 726, 727. 

 Toxodontia, 726. 

 Toxopneustes, 222. 

 Tracheae, of Arachnida, 318; of Myria- 



poda, 328 ; of Insecta, 339. 

 Tracheal gills, 340. 

 Trachyderma, 271. 

 Trachynema, 130. 

 Trachynemidce, 130, 143. 

 Tragulidce, 711, 712, 722. 

 Tragulus, 713. 

 Transformation, 42. 

 Tree-crabs, 311. 

 Tree-frogs, 522. 

 Tree-kangaroos, 603. 



Tree-pigeons, 617. 



Tremarctos, 740. 



Trematoda, 229 ; general characters of, 

 237 ; development of, 237, 238 ; habitat 

 of, 237. 



Tremoctopus, 423, 424. 



Treronidce, 617. 



Tretenterata, 393. 



Triarthra, 251. 



Tricheeidce, 737, 738. 



Trichecus, 738. 



Trichina, 245, 246. 



Trichocephalus, 245, 246. 



Trichocysts, 96. 



Trichoglossus, 621. 



Tricfioptem, 351. 



Triconodon, 654, 669. 



Tridacnidce, 403, 404. 



Trigoniadce, 403. 



'Trilobita, 297; structure of the crust of, 

 298 ; distribution of, in time, 314. 



Trimera, 362. 



Trimerettidce, 394. 



Trimeresurws. 542. 



Tringa, 611. 



Trionycidce, 531, 535, 537. 



Trionyx, 536. 



Triton (Amphibia), 517, 518. 



Tritoniadat, 413. 



Trochammina, 69. 



Trochilidce, 627. 



Trochoceras, 434. 



Trochocystites, 223. 



Troglodytes (Aves), 625; (Quadrumana) 

 734. 



Trogon, 620, 622. 



Trogonidce, 620, 622. 



Trogontheriuin, 761. 



Trombididce, 322. 



Trophi of Insects, 336. 



Trophosome, 111. 



Tropic Birds, 604. 



Tropidonotus, 543. 



Trough-shells, 404. 



Trout, 485. 



Truncated Shells, 37t). 



Trunk-fishes, 488. 



Trygon, 500. 



Tube-feet, of Echinus, 196, 197; of <lste- 

 roidea, 202 ; of Ophiuroidea, 206 ; of 

 Comatula, 214 ; of Holothuroidea, 218, 

 219. 



Tubicola, 259 ; characters of, 264 ; devel- 

 opment of, 265 ; distribution of, in time, 

 271. 



Tubifex, 264. 



Tubipora, 167. 



Tubiporidce, 166, 167, 185. 



Tubularia, 120. 



Tubularida (see Corynida). 



Tubulosa, 164, 165. 



Tunieata, 367, 368, 371; characters of, 

 380; branchial sac of, 382, 383, 384, 

 386, 387; circulation of, 383; nervous 

 system of, i&.; development of, 384-386 ; 

 alternation of generations of, 386; types 

 of, t6 ; homologies of, i&. ; distribution 

 of, in space and time, ib. , 387. 



Tunics of Ascidians, 381. 



Tupaia, 770. 



Tupaiidoe, 770. 



Turbellaria, 229; characters of, 238; divi- 

 sions of, 239. 



Turbinated Shells, 409. 



Turbinidce, 412. 



Turbinolidce, 164. 



Turbot, 487. 



Turkey, 614. 



Turnicidce, 615. 



Turnstone, 611. 



Turrilepas, 313. 



Turrilites, 434, 436, 437. 



Turritellidce, 412. 



Turtles, 527, 530, 535, 536. 



Tylodon, 751. 



Tylopoda, 711. 



Type, morphological, 20. 



Typhlopidce, 544. 



Typhlops, 544. 



Uintatherium, 725. 



Uintornis, 622. 



Urnbilicated shell of Gasteropoda, 410. 



Umbo, 398. 



Umbrella of Lucernarida, 137, 141. 



Unau, 675. 



