42 ANTHROPOID APES. 



coat. It differs widely from the chimpnnzee and 

 gorilla in these particulars. In the young male the 

 compression of the forehead is less marked than in 

 aged animals, and the bony crests which conduce to 

 raise the coronal arch in its upper and hinder part are 

 also absent. The supra-orbital arches are less strongly 

 developed, the jaws are less prominent, and the layers 

 of fat upon the cheeks are absent. The head is more 

 detached from the necdi:, the structure of the whole 

 body is slenderer, the expression of the countenance 

 is milder. A small, conical nail, blunted at the end, 

 may generally be observed on the great toe. 



In the adult female, as I have pointed out else- 

 where, the physical characteristics of the young 

 male are repeated in an exaggerated form. The skull, 

 displaying only very small bony crests, is indeed 

 high, but more rounded than in the aged male ; the 

 face is prominent, but the head is more detached 

 from the neck than in the latter case. On account 

 of the greater width of the pelvis, the body is still 

 more tun-shaped than in the aged male. When 

 giving suck, the breasts are distended in the form of 

 a half cone, but when this condition ceases they fall 

 together and only present two short, wrinkled, 

 slightly prominent folds of skin ; the small, horny 

 nipples are almost cylindrical ; and the areola, of 

 which the traces are scanty at all times, altogether 

 disappears. The throat-pouch is less strongly de- 

 veloped than in the aged male, but the limbs are as 

 fully developed. The head of the young female is 

 still more rounded, with a more flattened though 

 still projecting face, and the limbs are slenderer, and 



