562 QUADRUMANA. 



hands either very minute or entirely wanting. Exclusively arboreal 

 in their habits, the Spider Monkeys move on the ground with a 

 vacillating gait, dragging themselves along by means of their long 

 fore-arms, which they use like crutclies, the fist being half closed ; 

 or tliey walk in a crawling position, sustaining themselves on their 

 hintl feet only, and balanced by their long arms, and tail extended 

 ready to seize any object wljieh may help progression. But among 

 the branches of tlie trees their agility is ahuost equal to that of a 

 bird : the sensitive tip of the long tail lays hold oi a bough with the 

 facility and secmity of a fifth Land, while its grasp is sufficiently 

 powerful to sustahi the weiglit of the body as it swings. 



The monkeys of the eastern hemisphere differ 

 from the American monkeys in their teeth, which 

 are only thirty-two in number. Their nostrils are 

 placed close together, separated only by a narrow 

 partition, and in many species the tail is entirely 

 wanting. They may be divided in accoixiance with 

 the folio wino' Table : — 



