CHARACTERS OF THE SOUTH AMERICAN MONKEYS. 



9' 



Hapalidse and the Oebidse 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 cases as to be only just visible when the face is viewed 

 from the front, as in Cebus, Ateles, Cacajao (0%f,aharici), and Calli- 

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



Text-fieure 2. 



/ \ 



^ D 



H 



A. Nostrils of Cehns. 



M. „ ZiagotJirix. 



C. ,, Saimiris sciurea. 



I). Side view of muzzle of Aotus. 



E. Half profile view of the same, enlarged. 



F. Nostrils of tlie same. 



G. "N oatiils oi Alotiatta. 

 H. The same from above. 



I. Side view of muzzle of the same. 



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

 lateral, are visible to a great extent fi'om the fi'ont, and are 

 separated by a septum which hardly exceeds the long diameter 



