In the skull the facial region is much elongated, its measurement from the anterior margin of the orbit forward being greater than the longitudinal diameter of the orbit, and the space between the eye-sockets is narrow and depressed. The bony palate is short, extending back only to the posterior end of the median molar. The posterior portion of the ear-capsules (the mastoidal and squamosal regions) is not inflated--a character which separates this genus from _Galago_. The pre-maxillary bones are large and protrude in front, if the skull be viewed from the side. The angle of the lower jaw is not produced downwards and backwards. In some species a large maxillary sinus projects into the anterior part of the orbit; in some also the _foramen rotundum_ does not coalesce with the sphenoidal fissure (see page 11), but has a distinct opening. The teeth are of the normal number, namely thirty-six. In the upper jaw the incisors are small, sub-equal, and situated anteriorly to the canines and are not in contact with each other, or with the latter. The canines are very large, tusk-like, and set in an excavated notch on the jaw. All the pre-molars {67}have one main cusp to the outside; the anterior pre-molar, however, has a supplementary minute front cusp, while the median has in addition one large interior cusp; both it and the posterior pre-molars are vertically taller than their anterior fellow. The molars have two inner cusps, and two main outer cusps with a supplementary minute fore cusp, as well as two cusps on the ridge joining the fore and hind outer cusps; the posterior molar--the smallest of the three--is, however, larger than the posterior pre-molar, and has only the front inner cusp and no supplementary external cusp. The lower jaw shows a gap between the canine and the anterior pre-molar. The anterior pre-molar, which is vertically taller than the rest, is edged and cutting, taking the place of a tusk; the anterior and median pre-molars are also separated by a small space; the latter, which is equal in vertical height to the posterior, has an inner cusp and a low cusped heel. The molars have two outer main cusps, of which the front one is more developed than the hind one, and two inner cusps, often with an intermediate cusp between them; the pair of fore and the pair of hind cusps are joined by transverse ridges, and the two outside cusps by a backwardly directed semicircular ridge; the posterior molar is four-cusped. The dorsal and lumbar vertebræ together do not exceed twenty in number. The hind portion of the cerebellum is large, which points to intellectual inferiority in the True Lemurs as compared with the Apes.