400 



ELEMENTARY ZOOLOGY 



chief structural characteristics which distinguish man from 

 the other members of this order are the great development 

 of his brain and the non-opposability of his great toe. 

 Despite the similarity in general structure between him 



FIG. 158. " Bob Jordan," a monkey of the genus Cercopit/iecus. 

 (Photograph from life by D. S. Jordan.) 



and the anthropoid apes of the Old World, in particular 

 the chimpanzee and orang-outang, the disparity in size of 

 brain is enormous. 



The lowest Primates are the lemurs found in Madagas- 

 car, in which island they include about one-half of all 

 the mammalian species found there. The brain is much 



