{95}Cranium more vaulted and the muzzle remarkably shorter than in the genera _Indris_ and _Propithecus_; eye-sockets very large; the space between the eyes hollow. Temporal ridges not uniting into a single median ridge. Nasal bones projecting as far as the front end of the very small pre-maxillary bone. Lower jaw remarkably deep and broad behind; line of union of its two halves nearly half the length of the jaw, and in a straight line with the incisor teeth. Toothless space in front of upper jaw greater than in the other two genera. Dentition of the upper jaw: _incisors_ small, the outer larger than the inner, set close to the canines and not at the inner edge of the toothless space; _canines_ vertically short; _pre-molars_, with no inner cusp, but having a prominent outer cingulum (a character seen in no other species of Lemur); _molars_, four-cusped. Lower jaw: _incisors_ larger than in the two other genera, and less horizontal, the inner ones more slender than the outer. Anterior and posterior _molars_, five-cusped. Hind margin of palate reaching to the middle of the median molar. Central bone of wrist wanting (of all Primates agreeing in this character only with Man, the Chimpanzees, the Gentle- and Sportive-Lemurs and the Endrina); fourth digit of the hands and feet longest. Tail long. The small intestine not spirally coiled upon itself, but folded many times transversely. Hair long, woolly, dark Mouse-grey at base, reddish-brown in the middle, black at the tips. Face broad, entirely covered with short greyish-brown hairs; nose-pad alone nude. Ears concealed and covered by rufous hair; pupil of eye very contractile, very narrow and linear during the day; across the forehead and over the eyes a transverse lunulate whitish band, margined anteriorly by a black band. Back greyish-brown, the nape darker; a patch over the rump, and the base of the tail and buttocks white, washed with rufous; back and inner side of thighs and round the arms whitish; a narrow fringe on the lower margin of arms and legs ashy-grey, washed with rufous; fore-arm, hands and feet rusty-brown; tail bright dark red, deepest at its extremity. Under side and inner surface of limbs grey, washed with rufous. Length of body, 12½ inches; tail, 15¾ inches. {96}Of this species there are two forms, an _eastern_ and a _northern_, the latter being always smaller in size, with the fur lighter and less rusty. In some varieties the upper surface is dark rusty-red all over, and the inner sides of the limbs pure white. Examples from the north-west coast are constantly smaller; the head rounder, and the facial hairs grey; no white band on the forehead; upper surface bright yellowish-brown; tail rusty-grey; under side of hind-limbs pure white, the under surface and inner side of the arms whitish. The variation in coloration is due to the middle part of the hairs, which in typical specimens is rusty-red, but is yellow in the above-mentioned form. Hands and feet grey.