INDEX. 
Testudinide, 3138. 
Tetrabranchiate Cephalopods, 112; of the 
Cambrian, 89; of the Lower Silurian, 
112-114 ; of the Upper Silurian, 130; of 
the Devonian, 149; of the Carboniferous, 
186, 187; of the Permian, 199; of the 
Trias, 212; of the Jurassic, 237-229; of 
the Cretaceous, 272-274 ; of the Eocene, 
294; of the Miocene, 312. 
Textularia, 22, 264, 311 ; Meyeriana, 311. 
Thanet Sands, 287, 288. 
Theca, 88, 111, 129. 
Theca Davidii, 88. 
Thecidium, 213. 
Thecodont Reptiles, 218. 
Thecodontosaurus, 200, 218; antiquus, 219. 
Thecosmiha annularis, 231. 
Thelodus, 131. 
Theriodont Reptiles, 202, 220. 
Thylacoleo, 349. 
Tile-stones, 116. 
Titanotherium, 316 
Toothed Birds, 281-283. 
Tortoises, 202, 296. 
Tragoceras, 318. 
Travertine, 21. 
Tree-Ferns, of the Devonian, 136; of the 
Coal-measures, 164. 
. Tremadoce Slates, 77-79. 
Trematis, 110. 
Trenton Limestone, 95, 96. 
Trianthrus Beckvi, 107. 
Triassic period, 203; rocks of, in Britain, 
204; in Germany, 204; in the Austrian 
Alps, 205; in North America, 205; life 
of, 206-224. 
Triconodon, 254. 
Trigonia, 235, 255, 269. 
Trigoniadee, 198, 211. 
Trigonocarpum, 170 ; ovatum, 170. 
Trilobites, 84-87; of the Cambrian, 85, 87; 
of the Lower Silurian, 107, 108; of the 
Upper Silurian, 123, 124; of the De- 
vonian, 144, 145; of the Carboniferous, 
179. 
Trimerellide, 127. 
Trinucleus, 108 ; concentricus, 107. 
Trionycide, 296. 
Triton, 293. 
Trochocyathus, 266. 
Trochonema, 129. 
Trogontherium, 361; Cuvieri, 336, 361. 
Trumpet-shells, 293. 
Tulip-tree, 262, 308. 
Turbinolia suleata, 292. 
Turbinolide, 292. 
Turrilites, 272, 273; catenulatus, 274. 
Turritella, 271, 293 
Turtles, 202, 251, 280, 296. 
Typhis tubifer, 293. 
Ulimania selaginoides, 197. 
Unconformability of strata, 48. 
Under-clay of coal, 162. 
Ungulata, of the Eocene, 300-303 ; of the 
Miocene, 315-319; of the Pliocene, 327- 
329; of the Post-Pliocene, 353-357. 
Uniformity, doctrine of, 5-7. 
Unio, 250. 
407 
Univalves (see Gasteropoda). 
Upper Cambrian, 77-79; Chalk, 259; 
Cretaceous, 257, 260; Devonian, 135; 
Eocene, 287, 288; Greensand, 258; 
Helderberg, 135 ; Laurentian, 66 ; Llan- 
dovery, 115; Ludlow rock, 116; Mio- 
cene, 305; Oolites, 227 : Silurian period, 
115; rocks of, in Britain, 115, 116; in 
North America, 116-118 ; life of, 118-131. 
Ursus arctos, 359; Arvernensis, 330 ; fe- 
rox, 359; spelea, 360. 
Urus, 336, 356. 
Valley-gravels, high-level and low-level, 
339-341. 
Vanessa Pluto, 312. 
Varanide, 202. 
Vegetation (see Plants). 
Ventriculites, 264, 265 ; simplex, 265. 
Venus’s Flower-basket, 265. 
Vermilia, 197. 
Vespertilio Parisiensis, 304, 305. 
Vicksburg Beds, 289. 
Vines, 306, 309, 310. 
Vitreous Sponges, 264. 
Voltzia, 208; heterophylla, 209. 
Voluta, 271, 293 ; elongata, 271. 
Volutes, 271, 293, 312. 
Walchia, 196, 197 ; piniformis, 196. 
Walrus, 322. 
Wealden Beds, 257. 
Wellingtona, 309, 310. 
Wenlock Beds, 115, 117; Limestone, 115; 
Shale, 115. 
Wentle-traps, 271. 
Werfen Beds, 205, 296. 
Whalebone Whales, 299, 315. 
Whales, 299, 315. 
Whelks, 237. 
White Chalk, 259; structure of, 21, 22; 
origin of, 23, 263 
White Crag, 324. 
White River Beds, 307. 
Wild Boar, 354. 
Williamsonia, 230. 
Winged Lizards (see Pterosauria). 
Winged Snails (see Pteropoda). 
Wing-shells, 271. 
Wolf, 336, 360. 
Wolverine, 360. 
Wombats, 348. 
Woolhope Limestone, 115. 
Woolly Rhinoceros, 339, 341, 344, 353. 
Woolwich and Reading Beds, 287. 
Worm-burrows, 82, 83, 123. 
Xanthidia, 138, 161. 
Xenoneura antiquorum, 145. 
Xiphodon, 303. 
Xylobwus, 182; Sigillarice, 182. 
Zamia spiralis, 208. 
Zamites, 208, 230, 310. 
Zaphrentis, 105, 119, 142,173; cornicula, 
141; Stokesi, 104; vermicularis, 174. 
Zeacrinus, 175. 
Zechstein, 194. 
Zeuglodon, 299, 315; cetoides, 299, 300 
