174 PHILOSOPHY OF ZOOLOGY, 



7. Cynocephalus. Snout lengthened, with terminal 

 nostrils. 



B. Nails compressed, pointed. Thumbs of the hands 

 scarcely separate from the fingers. 



8 Hapale. Ouistiti. Head round ; face fiat ; but- 

 tocks hairy ; destitute of cheek-pouches. 



Grinders, twenty-four in number, 



A. Tail prehensile. 



a. The part of the tail used to grasp objects naked. 



9. Mycetes. Head pyramidal. The os hyoidis has a 



singular vesicular enlartjement communicating with the 

 o o o 



larynx. Simia seniculus and Beelzebub of Lin., belong to 

 this genus. 



10. Ateles. The thumb of the hand is concealed un- 

 der the skin. This generic distinction observable in the 

 Simia paniscus of Lin. ; ought probably to be employed to 

 form the primary divisions of the quadrumanous animals. 



h. Tail hairy. 

 1. Cebus. Thumbs distinct. Simia appella of Lin. 



B. Tail not prehensile. 



12. Calletrix. Simia Pithecia of Lin. 



Lemuridce. 



Incisors either not four in number in each jaw, or placed 

 on a divided line. 



A. Incisors in the lower jaw six in number. 

 a. Furnished with a tail. 



13. Lemuk. Macauco. The Lemur Macaco is the 

 type of this genus. 



14. Otolicnus. The tarsi are here greatly elongated 

 and disproportionate. The motions are slow. 



