16 ANTHROPOID APES. 



an ox. This resemblance is the more striking, as 

 the whole of this region is covered with glandular 

 skin of a deep black colour, which is either glabrous 

 or provided with a few scattered hairs, but furnished 

 with small flattened warts. 



Below the eyes the cheeks are broad and very 

 round, dwindling away and becoming depressed in 

 the lower part of the face. They are seamed with 

 curved wrinkles of varying depth, which tend down- 

 wards in the same direction as the wrinkles on the 

 lower eyelids. The short upper lip is provided with 

 oblique folds which converge outwards in the 

 centre. The points of the strong canine teeth, which 

 in many individuals are from 38 to 40 mm. long, 

 and 20 mm. wide, diverge a little from each other, 

 and stretch the upper lip in an oblique direction, 

 so that this part of the face takes the form of a 

 triangular, bevelled surface, with its prominent base- 

 line between the canine teeth. It may also be ob- 

 served that in many individuals of this species the 

 nose is not very deeply set on the upper lip ; that in 

 others, again, the nose is decidedly raised, and the 

 lip only presents a small hem below the nose. In 

 many such cases the prognathism of the face is 

 strongly marked, so as to give a baboon-like effect. 

 In other specimens, again, this debased type is not 

 allied with strongly marked prognathism. 



If we take a front view of the skull of an aged 

 male gorilla we see that the upper edges of the 

 great supra-orbital arches are bevelled off below and 

 at the sides. This bevelled form is repeated in the 

 broad cheek-bones, as we see them in front. The front 



