31 AN AND APES. 69 



difference between the different kinds of half- 

 apes themselves. 



The difference in external appearance be- 

 tween the apes and half-apes is accompanied 

 by a variety of important anatomical distinc- 

 tions.* 



The sub-order Lemuroidea is divided into 

 three families, as in the Anthropoidea ; but 

 while it is the highest family of the higher 

 sub-order, namely, the family Hominidce, 

 which contains but a single o;enus, but one 

 genus is found in the two lower orders of 

 Lemuroidea, namely, in the Cheiromyidce and 

 Tarsiidce, while the family Lemuridce contains 

 the bulk of the sub-order. 



All the Lemuroids eat vegetable food or 

 insects, and all are nocturnal in their habits. 

 None possess a prehensile tail, cheek-pouches, 

 or ischial callosities, and almost always the 

 muzzle is much more produced than in most 

 apes (Fig. 33). 



* For details see 'Pro. Zool. Soc.' 1873, May 20th, 

 " On the Zoological Rank of the Lemuroidea." 



