428 



GENERAL ZOOLOGY 



nails ; the thumb is opposable to the other digits, and the 

 eyes are directed forward. 



The spider monkeys (At'eles, Fig. 225) of South and Cen- 

 tral America are representative forms of the New World 



Fig. 225. Photograph of a spider monkey 

 American Museum of Natural History 



monkeys. They have a long tail, which serves as an organ 

 of prehension. The most man-like of the monkeys are the 

 orang-utan (Sim'ia sat'yrus) of Borneo and Sumatra, and 

 the gorilla {Goril'la goril'la) and chimpanzee (Anthro- 

 popithe'cus troglody'tes) of equatorial Africa. Of these the 

 chimpanzee (Fig. 226) is the most gentle in disposition and 



