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Show 452 PROF. A. H. GARROD ON GELADA RUEPPELLI. [May 20, With reference to the male, its general colour is a dark sooty chocolate-brown. The shoulder, forearm, back of hand, and instep, as well as most of the tail, with the exception of its end, are black. The palest brown is found on the abdomen, though this is very dark. A few white hairs mixed with the brown-black of the tail-tuft give that a lightish tint. The longest hair is that between the shoulders, where it reaches as much as eleven inches. This lengthy hair extends upwards over the occiput quite forward to the superciliary ridge, and downwards to the loins, below which it rapidly reduces before the base of the tail is reached. Laterally the long hair extends over the shoulders, and less considerably under the arms, towards the lateral margins and to the surface below the nude chest-space. The hair on the abdomen is about 2*75 inches long, that outside the thighs 4 inches, that on the tail an inch, except the end tuft, where it reaches 3*5 inches. The characteristic nude chest-space is double in the male, being formed of two median triangular isosceles areas reversely directed, with their apices approximate, but separated by an interval, 1*5 inch in length, of bair-covered skin. The base of the very obtuse-angled upper triangle, which is margined by black hair, is five and a half inches from the middle of the lower lip, and is situated opposite the larynx, its length being 3*75 inches, and its depth not being more tban an inch. The lower triangle is also very obtuse-angled, with its base, slightly concave downwards, six inches long. Although the two nude triangles above described do not meet, they tend to form an hour-glass surface of florid skin, 7*75 inches along each lateral curve from horn to horn. The hair bordering it is an inch long or so and iron-grey in tint, from the almost equal admixture of black and white hairs. There is no carunculation of the skin in the nude spaces or at their borders. The pair of nipples are closely approximate, not being more than a quarter of an inch apart in the dried skin. They are situated in the nude area of the lower triangle, an inch above its base. In the female the general tint is much the same as that of the male; the hair is very much shorter and less faded at the tips. The interscapular hair is the longest, reaching nearly four inches, whilst that of the loins is not so black as in the male. The pectoral nude space is in the female carunculated all along its lateral and inferior borders. The two triangles which go to form it join apically by an isthmus 1*3 inch broad. The marginal hair is not mixed with white. The caruncles are numerous, and about a quarter of an inch in breadth, being ovate and flattened. The nipples are situated as in the male, and are an inch apart. In both sexes the face is nude below the line of the frontal eminences, and laterally from points a little less than half an inch outside the outer canthus of each eye, the nude spaces running straight downwards in the direction of the angles of the mouth, just before reaching which they turn and include the chin. The ischial callosities, which are subcircular, and a little less than two inches in diameter, are situated in a naked area which is carun- |