The bridge of the nose rises gradually outwards from between the inner corners of the eyes, and is keel-shaped in the centre. This part of the head is from 70 to 80 mm. in length, longer and narrower in one individual, shorter and wider in another. The skin in this region is covered with a network of wrinkles of varying size. The end of the nose and the nostrils are high, conical, and very wide at the base. This part of the nose, attached to the very projecting forehead, has the effect of an altogether snout-like muzzle. It is intersected by a central longitudinal furrow, which divides the whole tip of the nose into two symmetrical halves. This furrow is more strongly marked in the case of adult animals than in the young. The aperture of the nostrils is large and triangular, with the cartilaginous point turned upwards, and the edges applied to the bridge of the nose and to the cheeks have a somewhat retreating appearance. The lateral margins of this part of the nostril take an arched form, first diverging in different directions, then gradually converging again towards the upper lip. The lip is short, and this, combined with the large nose, gives a certain resemblance to the mouth of 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 downwards 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 observed 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.