xii ILLUSTRATIONS 



PLATH FACING PAGE 



XXIII. Skeleton of "Hippidium" .... 252 



[Brit. A/us. Guiife to Horse family) 



XXIV. Fig. i. Skull of " Onohippidium" . . 260 



Fig. 2. Molars of " Equus," " Hippidium," 



AND " HiPPARION " „ 



[Bothfrotn " Brit. Mas. Guide to Horse Family ") 



TEXT-FIGURES 



PAGB 



Bones of Fore-leg of Horse and Rhinoceros . . 6 



{Brit. Mus. Guide to Great Game) 



Skull of Pig-like Animal, "Elotherium" . . 20 



Molars of Single-toed and Thres-toed Horses . 33 



The Ancestors of the Horse and its Relatives 



compared ........ 240 



{After Lull) 



Milk-molars and Premolars of the Extinct " Meryc- 



hippus" 255 



(After Lull) 



Bones of the Fore and Hind Feet of the Extinct 



"Hipparion" 257 



{After Lull) 



Crown Surface of Upper Molar of the Extinct 



"Hipparion" 258 



{AfUr Lull) 



Bones of the Fore and Hind Feet of the Extinct 



"Hypohippus" 261 



{After Lull) 



Upper Molar Tooth of " Anchitherium" . . 267 



Bones of the Fore and Hind Feet of the Extinct 



"EoHippus" 274 



{After Lull) 



Bones of the Fore and Hind Feet of the Eocene 



"Phenacodus" 276 



{After Lull) 



