TEETH AND THEIR VARIATIONS. 



223 



those of the very earliest Ungulates of the Ter- 

 tiary period than 

 is the case with 

 any other living 

 member of the 

 order, except the 

 little Hyrax or 

 so-called Coney 

 of the Bible. The 

 explanation of 

 this absence of 

 modification in 

 the structure of 

 the foot of the 

 recent as com- 

 pared with the 

 extinct Ele- 

 phants is, how- 

 ever, not far to 

 seek. By reason 

 of their huge 

 bulk these ani- 

 mals have had 

 no need to fear 

 the attacks of 

 other creatures, 

 so that there was 

 no necessity for 

 the development of a limb suitable for extreme speed, 

 while the huge bulk of their bodies of itself also 



