THE FORERUNNERS OF THE HORSE 261 



modern horse ; but when we come to the more 

 primitive types, of which the American Hypohippus 

 is the first for notice, such remarkable differences 

 from the existing forms are found that the question 



Front View of the Bones of the Right Fore (a) and Hind (d) Feet of the 

 Extinct American Hypohippus equinus, \ natural size 



of the limitations of the family forces itself to 

 the front. And here it may be noted that it is 

 the very completeness of our knowledge of the 



