THE FORERUNNERS OF THE HORSE 257 



from the adjacent column of the main body of the 

 crown, which are evidently remnants of the neck 

 of enamel connecting the latter with the anterior 



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

 Extinct American Hipparion^ natural size 



pillar in the more typical members of the family. 

 The grinding surface of the anterior pillar forms 

 a regular ellipse. Another feature of the hipparion 



- R 



