In _Hapalemur_ the teeth are of the normal Lemurine number, viz., 36; but the dentition as a whole is peculiar and characteristic. Each series of teeth is very uniform and equal, and those anterior to the molars are serrated. In the upper jaw the incisors are very small, sub-equal, and situated close together; the posterior tooth on each side being (when the skull is viewed from the side) internal to and touching the canines. The canines are small, and the gap between them and the anterior pre-molar is very small. The anterior pre-molar is slightly taller vertically than its median fellow, and stands close up to it without an interval; it has one main (and sometimes one rudimentary) outer cusp; the posterior pre-molar, which closely resembles a molar, and is often the largest tooth in the jaw, having one inner cusp united by ridges to its two outer cusps. The molar teeth are sub-equal to the hindmost pre-molar, and have one front inner and two outer cusps, without an oblique ridge between them, and also a well-developed cingulum, cusped externally. Of the lower teeth, the anterior and median pre-molars are set obliquely, the median having three outer and two inner cusps (the two inner being united to the two hind outer by ridges). The posterior pre-molar is quite molariform, and, with the molars, presents three outer and two (or three) inner cusps, of which the two inner are united by ridges to the outer hind cusps, while transverse ridges unite the main outer and inner cusps together. The molars are cingulate towards the outside. PLATE VIII. [Illustration: THE GREY GENTLE-LEMUR.] {81}The brain is narrower and shallower than that of the genus _Lemur_, and presents no specially close resemblance to the same organ in the _Indrisinæ_ or the _Lorisinæ_. I. THE GREY GENTLE-LEMUR. HAPALEMUR GRISEUS. _Lemur griseus_, Geoffr., Mém. sur les Makis. Mag. Enc., i., p. 48 (1796). _Hapalemur griseus_, Is. Geoffr., Cat. Méth. Primates, p. 74 (1851); Mivart, P. Z. S., 1864, p. 613 (Skull); Schleg., Mus. P. B., vii., p. 361 (1876). _Hapalemur olivaceus_, Is. Geoffr., Cat. Méth. Primates, p. 75 (1851); Schl., Mus. P. B., vii., p. 316 (1876). _Cheirogaleus griseus_, Giebel., Säugeth., p. 1018 (1856); V. der Hoeven, Tijds. Natuurl. Gesch., p. 38, pl. i., fig. 1 (1844). _Hapalolemur griseus_, Scl., P. Z. S., 1863, p. 161; Gray, P. Z. S., 1863, p. 828, pl. lii. (_Plate VIII._) CHARACTERS.--Fur long and soft, not woolly; ears short, hairy, with long black vibrissæ between them; tail bushy, and as long as the body; general shade above greyish Mouse-colour, washed with rufous and speckled with black on the crown, back and external surface of limbs; shoulders and fore-limbs bluish-grey; cheeks, throat, breast, and inner side of limbs ochraceous white; under side of body whitish-yellow; tail and hands grey, washed with black. Body and tail equal, 15 inches in length.