Darwinism 



CHAP. 



Hind- Fore 



RECENT. 

 Equus. 



PLIOCENE. 



Pliohippus. 



Protohippus 

 (Hippario7i). 



MIOCENE. 



Miohippus 



(Anchitherium). 



Mesohippus. 



EOCENE. 

 Orohippus. 



Fig. S3. — Geological devclupmeiil ul Llic horse trilte (Eohippus since discovered) 



