MONKEYS OF THE OLD WORLD. 



305 



does the brain, which in Chrysotlirix, etc., is nearly 

 smooth, while in Gelus (Figs. 328, 339) the hemispheres 

 are nearly as much convoluted as in the catarrhine apes 

 (Huxley.) 

 The monkeys of the Old World intergrade with the apes, 



Fja. 327.— Head of Ateles marginatus. Fio 328 —Head of Cehus capucinus. 



From Darwin. From Darwin. 



Fia, 329. — Head of C'ebus velierosus. 

 From Darwin. 



Fio. 330.— Head of Semnopithecus 

 cornutus. From Darwin . 



and are thus more sjiecialized or highly developed than 

 those of the New "World. The septum of the nose is nar- 

 row, hence they are said to be catarrhine or thin-nosed, 

 while the tail is short and not prehensile. 

 The catarrhine monkeys {Cercopithecidce) walk on all- 



