24 ANTHROPOID APES. 



not SO decidedly prognathous, and the bridge of the 

 nose is shorter. The lines of the body in the young 

 male are softer and less exaggerated, and the expres- 

 sion of the face is less ferocious than in an aged 

 male. The homy callosities on the hands and feet 

 are altogether wanting or only faintly indicated, and 

 the hands, fingers, and toes have not arrived at the 

 powerful development which we observe in the older 

 animal. (Comp. Figs. 3 and 4.) 



Considerable differences may be observed in the 

 whole structure of the adult female gorilla. The 

 animals of this sex are smaller and weaker than 

 males of the same age. Tlie skull of the female is 

 smaller and more rounded than that of the male, 

 and the great bony crests are also absent. The orbits 

 are less prominent, and a front view of the bead 

 gives the impression of a trapezoidal form. The 

 coronal arch rises above this trapezoid. In the 

 male, on the contrary, the crown seems to lengthen 

 above and behind into a pyramidal form. In 

 the aged female the bridge of the nose is gene- 

 rally shorter than in the aged male, but even in 

 this particular there is great variation in different 

 individuals. Sometimes the bridge of the nose in a 

 female is much depressed, and then the interval 

 between the orbits and the end of the nose is 

 shorter : I intentionally avoid the term ti-p of the 

 nose, on account of the blunted form of this organ. 

 Even when the bridge of the nose is more promi- 

 nent, the interval between its end and the orbits is 

 sometimes very short. 



The aged female gorilla usually has wider cheeks. 



