168 



ANIMALS OF THE PAST 



even the suggestion of a fourth toe. From 

 this to our Eocene Hyracothere with four toes 

 is only another long-time step. We may go 

 even beyond this in time and structure, and 

 carry back the line of the horse to animals 



I li II 1 



PBOTOROHIPPUS HESOHIPPUS MESOHIPPUS 



VEKTICOLUS. COPE BA1RMI. LEIW PRAESTANS. COPE 



Fig. 34. The Development 



which only remotely resembled him and had 

 five good toes to a foot ; but while these con- 

 tained the possibility of a horse, they made no 

 show of it. 



Increase in size and decrease in number of 



