444 PRACTICAL ZOOLOGY 



The South American monkeys are arboreal and of small or medium 

 size (Fig. 313). The tail is usually long and prehensile, aiding in 

 climbing. The space between the nostril openings is wide. 



FIG. 312. Ruffed lemur. (From Elliott. Courtesy American Museum of 

 Natural History.) 



The Old World monkeys are mostly quadrupedal (Fig. 314) 

 and usually possess a long tail which is never prehensile; their 

 nostrils are separated by a narrow space, and many of them 

 have cheek pouches. 



The anthropoid apes are the primates most nearly like man. 

 The tail is absent and locomotion is often bipedal. There are 



