168 THE NATURAL HISTORY OF 



mal has a fulvous or reddish-yellow colour; as it 

 advances in age, the colour gradually changes. A 

 gray discoloration first shows itself on the hands, 

 the forehead, and the tip of the tail ; from these parts 

 it gradually extends to the neck, the shoulders, and 

 the flanks, and assumes from time to time a darker 

 hue, until the coat of the animal is jet black above, 

 and gray underneath. 



" The face is regularly circumscribed by hairs, 

 which are long, and closely applied to the head; 

 the forehead, which is gradually sloping, is entirety 

 concealed by them. The orbits of the eye are rather 

 prominent ; and the bones of the nose short. The 

 nose consists of an angular ridge, which is con- 

 siderably elevated between the eyes, and terminates 

 without any fleshy protuberance, by a membrane 

 which is gradually attenuated below, and on each 

 side of which the nostrils are placed. These are large, 

 oblong, slightly curved, and pass backward into the 

 cranium in a horizontal direction. From the termi- 

 nation of the nose to the mouth a considerable space 

 intervenes ; but the lips are small and thin, so as to 

 exhibit, when slightly retracted, the interior of the 

 mouth. The chin is short and small ; a circle of 

 gray hairs encloses the mouth in the adult animal ; 

 and on the chin the hairs have a disposition down- 

 ward, so as to exhibit the appearance of a beard. The 

 upper part of the face is nearly naked ; a few strag- 

 gling stiff hairs are scattered on the cheeks and the 



