Fig. 1. 



a. 



I. 



c. 



d 



e. 



The Ancestoks of the Horse and its relatives compared in size and 



FORM with their TYPICAL MODERN REPRESENTATIVE. 



a. Hyracotherium or Protorohippus, of the Lower Eocene ; h. Plagiolophus, 

 or Orohippus, of the Middle Eocene ; c. MeHohipjms, of the Oligocene ; 

 d. Merychippus, of the Miocene ; e. PUohippus, of the l^liocene ; f. The Modern 

 Horse, Equus caballus, domesticated breed. (LiiW, Amer. J. Sci. vol. xxiii, p. 167.) 



[To /ace page's. 



I 



