QUADRUPEDS. 175 



b. No tail. 



15. STENOPS. The summits of the grinders are more 

 pointed than in the two preceding genera. 



B. Incisors in the lower jaw fewer than six. 



16. LICHANOTUS. Lower incisors four in number. No 

 tail. 



17. TARSIUS. Lower incisors two in number. Fur- 

 nished with a tail. 



2. Thumbs incapable of acting in opposition to the fin- 

 gers. 



The animals which belong to this division, denominated 

 by CUVTER Sarcophaga, are incapable of grasping objects 

 with the same dexterity or firmness as those which have sepa- 

 rate thumbs. They retain the hold of their prey, however, 

 by means of their long claws, aided by the pressure of the 

 foot upon the object. The eyes are not directed ventrally, as 

 in Man. The cerebellum is destitute of the covering of the 

 posterior lobes of the cerebrum. The orbitar and tempo- 

 ral fossse are united. Their sense of smell is, in general, 

 acute. They are chiefly supported by animal food. Their 

 jaws have a very limited lateral motion, and their intestines 

 are narrow. They admit of subdivision from their organs 

 of motion. 



CHEIROPTERA. 



Furnished with wings. 



The Cheiroptera, consisting of the bats, are peculiarly 

 characterised by a naked expansion of the skin uniting the 

 anterior and posterior extremities. By means of this ex- 

 panse of membrane, the act of flying can be easily perform- 

 ed. They walk awkwardly. Their tusks are large, and 

 their incisors frequently fall out at an early age. They 



