LIST OF ILLUSTRATIONS. XV 



no. 



150. Phascolotheriutn bucklandi. Left mandibular ramus . . 256 



151. Triconodon mordax. Right mandibular ramus . . . 257 



152. Lower Jaws of American Upper Jurassic Polyprotodont 



Mammals .......... 258 



153. Acdestis oweni. Right mandibular ramus .... 262 



154. Abderites meridionalis. Right mandibular ramus . . . 262 



155. Thylacoleo camifex. Skull and mandible .... 264 



156. Diprotodon australis. Skull and mandible .... 265 



157. Diagram to illustrate the Tritubercular Theory . . . 268 



158. Zeuglodon cetoides. Upper molar ...... 270 



159. Halitherium sehinzi. Restoration of skeleton .... 276 



160. Megatherium americamim. Mandible ..... 279 



161. Scelidotherium leptocephalum. Skeleton ..... 281 



162. Olyptodon clam'pes. Skeleton without carapace . . . 284 



163. Carapace and tail-sheath . . . 285 



164. Hyracops (? Meniscotheriuiri) socialis. Feet .... 289 



165. Phenacodus primcevus. Skeleton ...... 291 



166. Coryphodon liamatus. Teeth ....... 293 



167. Cranium and feet .... 294 



168. Restoration of skeleton . . . 295 



169. Dinoceras mirabile. Cranium and feet ..... 296 



170. Tinoceras ingens. Restoration of skeleton .... 297 



171. Diagrammatic vertical longitudinal Sections of Molars of 



Proboscidea . . . . ..... 300 



172. Dinotherium giganteum. Skull and mandible . . . 302 



173. Upper dentition .... 303 



174. Mastodon longirostris. Upper milk-molars .... 304 



175. angustidens. Restoration of skeleton . . . 305 



176. Elephas primigenius. Upper milk-molars .... 306 



177. Homalodontotherium segovice. Manus . . ... . 308 



178. Typotherium cristatum. Skull and mandible . . . .312 



179. Toxodon platensu. Restored skeleton ..... 313 



180. Feet of Ungulata Litopterna ....... 316 



181. Astragalus of Perissodactyla and Artiodactyla . . . 319 



182. Diagram illustrating the Evolution of the Limbs and Molars 



in the Equine Ungulata . . . . . . . 320 



183. Hyracotherium tapirinum. Teeth ...... 323 



184. (Protorohippus) venticolum. Restoration of 

 skeleton .......... 324 



185. Pcticeotheriwn craasum. Maxilla ...... 326 



186. magnum. Restoration of skeleton . . . 327 



187. Mesohippus bairdi. Teeth ....... 327 



l*s. intermedius. Feet ...... 328 



189. Molars of Titanotheriidte . . 329 



