This large Baboon is the principal one with a very short stump of a tail, and may be distinguished from all others, with and without long tails, by the enormous swellings of its cheeks on each side of its nose, and their odd colouring. In general shape it resembles the rest of the genus, but perhaps its head and chest may be more bulky, and its limbs shorter and stouter than the others, when it has attained its full growth. A full-grown male measures five feet when standing upright, and the colour of the hair is a light olive-brown above and silvery-grey beneath, and the chin is decorated with a small pointed yellow beard. It has a “brutus” in the form of a great tuft of hair on the top of the head, Nature having brushed up the hair off the temples and forehead upwards, in a peak-shaped ridge on the crown, giving a triangular appearance to the whole. The ears are naked and pointed near their tips, and their colour is bluish-black. The muzzle and the lips are large, and as it were swollen and projecting, and the former is not only long, but is surrounded above with an elevated rim or border, and cut short or truncated like that of a Hog. But the most extraordinary features of this ugliest of faces are the projections on each side of the nose. These are formed by swellings of the cheek-bones along the base of the great canine teeth, and the skin covering them is ribbed, and has ridges which are alternately light blue, scarlet, and deep purple in colour, contrasting strangely with the other tints of the hair. To add to the strange look, the eyes are deeply sunken, and their colour, a deep hazel, contrasts with a streak of vermilion, which reaches down each side of the nose to the lip, and extends upwards in the neighbourhood of the brows, which are large and “beetled.” A forehead would clearly be out of place in such a brute, and therefore it recedes rapidly above the eyes, and is lost in the great tuft of hair. The canine teeth are immense, and when the animal is enraged they and the others are shown, their beautiful white colour contrasting with the strange medley of tints around them. On the body the hair is very bristly, but the hands and feet are naked, and as if to add to the many peculiarities of the Mandrill, they are small in relation to the vigorous-looking limbs and short chest.