the face, is short and obtuse; the nose is slightly rounded, almost flat above, and the nostrils, as usual in tliis genus, are pierced laterally. The ears, which, from their erect position, and their projection beyond the cranium, give a peculiar distinctive character and appearance to the other species, in our animal are disposed horizontally, and instead of rising up toward the crown of the head, incline backward, and extend but little from its sides ; the lobes, as usual, are very thin, membranaceous, semitransparent, thinly beset with delicate hairs ; several tufts of longer hairs arise from the base, where the interior membranaceous lobules are discovered, but in our specimen too much contracted to admit of a detailed description. The neck is very short, and the anterior extremities have the same proportion to the body as in the other species. The hands are externally covered with a very soft down ; internally they are naked, and provided with several rather prominent protuberances, which, according to the opinion of Mr. Fischer, arc calculated to assist the animal in climbing. The fingers are deeply divided, and very delicate ; those of the hands have the same proportion, one to the other, as they have in man; on the feet they are more lengthened, and slender; the third finger is longer than the middle finger, and the thumb is proportionally short. * Grinders.-In the upper-jaw five ; the first rather broad at the base, angular, simple, pointed : the second and third smaller than the first, but larger successively, somewhat compressed, each having a single point, with an additional projection anteriorly and posteriorly, representing a compressed base, from which the point rises ; the fourth and fifth very large, and nearly equal, consisting of a broad base, from which project three high, acute, somewhat angular points, one on the interior, and two on the exterior margin, having in the middle a considerable concavity : in the lower-jaw five, the three anterior consisting of a single point ; the first broad at the base, pyramidal, acute, somewhat oblique, encircled at the base by a margin, larger than the second and third, which being removed somewhat interiorly, in consequence of the curvature of the lower-jaw, have a disposition slightly different from the corresponding teeth in the upper-jaw : the fourth and fifth are large, and resemble those which are opposed to them; the points on their surface are less regular; they form two transverse ridges in the anterior and posterior part of the crown, between which is a considerable groove. G. (a) 3,