204 THE NATURAL HISTOEY OP 



THE MONKEYS OF SOUTH AMERICA ; 

 THOSE OF THE NEW WORLD. 



THE forms contained in this division are almos 4 

 entirely confined to the tropical regions of the Southern 

 Continent.* They differ in a remarkable degree from 

 all those we have described in the previous part of this 

 volume, and in no instance can the South American 

 species be classed with the inhabitants of the Indian 

 or African Continents. The most striking outward 

 differences, are the smaller size and less ferocious 

 manners of the greater number, the prehensile tail 

 of many, and the want in all of the cheek-pouches 

 and naked callosities. Internally, the larynx is re- 

 markable for its great developement, and the teeth are 

 thirty-six instead of thirty-two, and, besides, differ 

 considerably in their structure, as will be perceived in 

 the woodcuts we have introduced. 



In the arrangement of this geographical group, we 

 have followed that of Geoffrey Saint Hilaire, with the 

 exception of placing the howlers (Mycetes) first, as the 



Named Plafyrrhini by Geoffrey. 



