418 



ZOOLOGY 



high at the shoulder, and having rather the appearance 

 of a small dog. This little beast is named Eohippus, 

 which literally means "the horse of the dawn," the 



From Lull's " Yale Collection of Fossil Horses" 



FIG. 196. Sketches showing the evolution of the horse from the primitive four- 

 toed ancestor to the last American species. Restored by Dr. R. S. Lull from speci- 

 mens in the collection of Yale University, i, Eohippus, Lower Eocene; 2, Oro- 

 hippits, Middle Eocene; 3. Mesohippus, Oligocene; 4, Merychippus, Miocene; 

 5, Ptiohippus, Pliocene ; 6, Equus scotti, Pleistocene. 



