xii ILLUSTRATIONS 



PLATE FACING PAGE 



XXIII. SKELETON OF "HIPPIDIUM" .... 252 



(Brit. Mus. Guide to Horse Family] 



XXIV. FIG. i. SKULL OF " ONOHIPPIDIUM " . . 260 

 FIG. 2. MOLARS OF " EQUUS," " HIPPIDIUM," 



AND " HlPPARION " 



(Both 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 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 



" HlPPARION " 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 



"Eomppus" 274 



(After Lull) 



BONES OF THE FORE AND HIND FEET OF THE EOCENE 



"PHENACODUS" . . . . . .276 



(After Lull) 



