xii ILLUSTRATIONS 



PLATE FACING PAGB 



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



(Brit. Mas. Guide to Horse Family) 



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



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

 AND " HiPPARION "... . , 



{Doth from " Brit. Mus. Guide to Horse Family") 



, TEXT-FIGURES 



PAGE 



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 Thre^-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 



(After 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) 



