INDEX. 



60 1 



Thylacinus, 408. 



Thylacoleo, 412, 418. 



Thysanura, 187. 



Tornatella, 261. 



Tornatellidce, 261. 



Tortoises, 358, 359. 



Toucan, 395. 



Toxoceras, 291. 



Trachydenna, 139. 



Trachynemidce, 74. 



Tracks, of Annelides, 141, 142. 



Tremadoc Slates, 512, 515. 



Trematis, 212. 



Trenton period, 508, 516. 



Triassic period, rocks of, 530; life of, 533; 



flora of, 496. 

 Trichecidce, 450. 

 Trichites, 225. 

 Trichotropis, 247. 

 Triconodon, 406, 411 

 Tridacna, 232. 

 Tridacnidce, 218, 232. 

 Trigonia, 228, 229. 

 ?s, 287. 



B, 218, 228, 530. 

 ....irpurn, 482, 484, 492,494. 

 bita, characters of, 160 ; distribution 

 of, in time, 167; families of, 167-171. 

 Trimerocephalus, 170. 

 Trinucleidce, 167, 169. 

 Trinucleus, 162, 167, 169. 

 Trionycid<z, 358, 359. 



Trionyx, 359. 



Tristichopterus, 327. 



Triton, 247. 



Trochoceras, 281, 283, 292. 



Trochocyathus, 537, 543. 



Trochocystites, 132. 



Trochoseris, 96. 



Trochovmilia, 543. 



Trochus, 256. 



Trogonidce, 395. 



Trogontherium, 459. 



Tropidaster, 537. 



Tubicola, characters of, 137 ; distribution 

 of, in time, 138. 



Tubiporidce, 101. 



Tubularia, 74. 



Tubulipora, 198. 



Tubulosa, 96 ; distribution of, in time, 97. 



Tunicata, 187. 



Turbinaria, 96. 



Turbinella, 247. 



Turbinidw, 255, 264. 



Turbinolia, 92. 



Turbinolidce, 97, 100. 



Twrfto, 255, 256. 



Turrilepas, 152, 153, 154, 155. 



Turrilites, 276, 288, 292. 



Turritella, 253 



TurriteUidce, 253. 



Turtles, 358, 359. 



Unionidce, 218, 229. 



Univalve Shells, 240, 241. 



Unrepresented time, 32-36. 



Upper Cretaceous Rocks, 540. 



Upper Oolitic Rocks, 536. 



Uraster, 111, 113, 114, 115. 



Urocondylus, 352. 



Urodela, characters of, 347 ; distribution 



of, in time, 347, 349. 

 Ursidce, 449, 450. 

 J7r*t, 451. 

 frtw, 439, 400. 



Fofoata, 245, 555. 



Valvular pyramid, of Cystideans, 131. 



Varanidce, 362. 



Vegetable kingdom, divisions of 473 



Veneridce, 218, 219, 236. 



Ventrieulites, 67, 70. 



Fentw, 236. 



Vermetus, 137, 138, 242, 253. 



Verruca, 152. 



Ferrweufoe, 150, 152. 



Vertebrata, characters of, 299; skeleton 



of, 300 ; distribution of, in time 306 

 Vespertilio, 461, 462. 

 Vespertilionidce, 461. 

 Vibracnla, 194. 

 Vincularia, 544. 

 Viperine Snakes, 360. 

 Virg\daria, 101. 

 Viverra, 452. 

 Viverridce, 449, 452, 453. 

 Voltzia, 476, 497, 533. 

 Valuta, 249, 250. 

 Volutidce, 249. 

 Fw/pe*, 454. 



Walchia, 495, 496, 529. 

 Waldheimia, 204. 

 Wealden, 540. 



Wellingtonia, 502. 



Wenlock series, 516. 



Whalebone Whales, 419. 



White Crag, 555. 



Williamsonia, 497. 



Woolwich and Reading Series, 548. 



Xanthidia, 69. 



Xantholites, 180. 



Xanthopsis, 180. 



Xenoneura, 185. 



Xiphodon, 431. 



Xiphosura, characters of, 174; distribu- 



tion of, in time, 174, 175. 

 Xiphoteuthis, 299. 

 Xylobius, 184. 



(Tllmania, 475, 496, 529. 



Umbrella, 262. 



Uncites, 206. 



Uneonfonnability, of strata, 33. 



Undina, 327. 



Ungulata, characters of, 423 ; divisions of, 



423. 

 Unio, 229. 



, 496. 

 Zamites, 497. 

 Zaphrentis, 89. 

 Zechstein, 529. 

 Zeuglodon, 421. 

 Zeuglodontidce, 419, 421. 

 Ziphioid Whales, 419, 420. 

 Ziphius, 421. 



Zoantharia, 73,S6;Malacodermata,85,S6; 

 Sclerobasica, 87 ; Sclerodermata, 88-97. 

 Zonites, 246, 266. 

 Zoocapsa, 152. 

 Zygosaurus, 353. 



