SEMNOPITHECUS MATTRTjS. 
narrowed at the jaws. The general character of the face is a flatness above, and a 
protrusion of the maxillae ; but the appearance of the face differs greatly in old and 
in young subjects. The maxillae become extended as the animal advances in age, 
and in young subjects the facial angle is proportionally greater. 
The face is regularly circumscribed by hairs, which are long, and closely 
applied to the head ; the forehead, which is gradually sloping, is entirely 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 considerably 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 termination 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 incloses the mouth in the adult animal ; and on the chin the hairs have a 
disposition downward, so as to exhibit the appearance of a beard. The upper part 
of the face is nearly naked ; a few straggling, stiff hairs are scattered on the cheeks 
and the upper lip, and on the more prominent part of the nose an interrupted series 
is observed. The irides of the eyes are of a dark brown colour. The ears are 
concealed from view by the long hairs which cover the lateral parts of the head ; 
they are margined, and both in form and disposition of external parts, closely 
resemble these organs in man. The neck is short, and considerably contracted. The 
trunk is of great length, broad and robust about the shoulders and the breast, and 
gradually of smaller dimensions towards the loins. The buttocks are marked with 
very large, rough callosities. The mammae in the adult female, are lengthened and 
cylindrical. The tail is as long as the body and head taken together ; in some 
individuals, and particularly in young subjects, it exceeds these parts in length : it 
is cylindrical during the greatest part of its length ; the base is gradually tapering, 
and the tip is thickened, and terminated by a close tuft of long hairs, of an ovate 
form. 
The most distinguishing character of the animals of this genus is the great 
length of the extremities : the arms and forearms are particularly slender ; the 
posterior extremities are more lengthened and more robust ; so that in the most 
usual attitude of moving, the rump is considerably elevated. The hands and fingers 
of the anterior extremities have a length and delicacy proportioned to these members; 
the thumb is very short and small, and removed far from the fingers. The hands of 
the posterior extremities are of extraordinary length, calculating, from the origin of 
