CENOZOIC TIME — TEETIAKY. 



913 



TV. Recent. 



Equus. 



1540. 

 Fore foot. Hind foot. Forearm. "Leg. Upper molar. Lower molar. 



in. Pliocene. 



(2) Pliohippds. 



o 



(1) Protohippus. 



II. Miocene. 



(2) MiOHippus. 



(1) Mesohippus. 



I. Eocene. 



Oeohippus 

 (Hyracotherium) . 



bJ 



Illustrations of the characters of successive genera under the Horse type. From Marsh. 



Another important fact in the history of life as suggested by Lartet 

 from some early European Mammals, and demonstrated by Marsh from the 



DANA'S MANUAL — 58 



