CHARACTERS OF THE SOUTH AMERICAN MONKEYS. 



93 



Hapalidge and tlie Cebida3 the internarial septum is wide, greatly 

 surpassing in width the longest diameter of either nostril, and 

 the nostrils look outwards and slightly forwards, but so slightly 

 in some CMses as to be only jnst visible when the face is viewed 

 from the front, as in Cebns, Ateles, Cacajao (Oiiakarla), and Calli- 

 cehus (text-figs. 1 & 2, A-C). But in two of the genera — Aotus, 



Text- figure 2. 



A. Nostrils of Cehus. 



B. „ Lac/oflirix. 



C. ,, Saiiiiiris sciurea. 

 1). Side view of muzzle of AoUis. 



E. Half prolile view of the same, enlara,e(l. 



F. Nostrils of tlie same. 



G. Nostrils of a. 



H. The same from above. 



I. Side view of muz/.L' of the same. 



X h- 



as recorded by H. 0. Forljes, and Alouatta — the nostrils are less 

 lateral, are visible to a great extent from the front, and are 

 separated by a septum which hardly exceeds the long diameter 



