Mastoid portion of ear-capsules (periotic-bones) not so inflated as in _M. minor_; hind border of bony palate extending to the posterior border of the last molar, its posterior foramina being large; pre-maxillary bones very large and projecting beyond the incisor teeth; angle of lower jaw pointed and hooked. Upper inner incisors standing in front of the canines, and nearly twice the size of the outer; no gap between the canines and the anterior pre-molar; the pre-molars vertically sub-equal, and with one external cusp; molars with two external cusps, the hinder of the two united to the large inner front cusp by an oblique ridge, their inner side bounded by the cingulum; the posterior molar smaller than the two anterior. Anterior and median lower molars four-cusped; the posterior, the largest of the cheek-teeth, five-cusped. DISTRIBUTION.--The Dormouse Dwarf-Lemur inhabits the south-west coast of Madagascar; it has also been obtained at Bambotoka in St. Augustin's Bay on the west coast. III. SMITH'S DWARF-LEMUR. MICROCEBUS SMITHI. _Microcebus pusillus_, G. R. Waterh., Cat. Mamm. Mus. Zool. Soc., 2nd ed., p. 12 (1838). _Cheirogaleus smithii_, J. E. Gray, Ann. Mag. Nat. Hist., 1842, p. 257. _Chirogaleus pusillus_, Flower and Lydekker, Introd. Mamm., p. 690 (1891, pt.) {58}_Microcebus smithii_, Mivart, P. Z. S., 1864, p. 641; Forsyth Major, Nov. Zool., vol. 1., p. 12; Taf. ii., figs. 3, 4, 12, and 13 (1894) (with full synonymy). (_Plate VI._) CHARACTERS.--Closely related to the foregoing; the fur in most specimens less woolly than in the other species; eyes large; snout longer and more pointed; ears shorter, less than half the length of the head; ankles proportionally shorter; fingers and toes longer; fur generally darker, the tail not markedly different from the back, very Rat-like in form; the dark marks in front of the eye extending to the tip of the nose, inside of the ears more ferruginous; size about that of a Rat. Muzzle longer and more pointed than in _M. myoxinus_; pre-maxillæ more produced in front, and nasals more produced above the nostrils; bony palate less prolonged backwards beyond the posterior molar, the hind perforations of the latter large; the line of union of the two halves of the lower jaw shorter than in _M. myoxinus_; upper incisors set anterior to the canines, and distant from the inner margin of the pre-maxillæ, the inner pair larger than the outer pair; the anterior upper pre-molar less vertically extended than the median one; median and posterior lower molars having the hind outer cusp lower and longer than the front outer cusp. DISTRIBUTION.--Smith's Dwarf-Lemur is known from Fort Dauphin, on the south-east coast, from Betsileo in the centre, and from the south coast of Madagascar. PLATE VI. [Illustration: SMITH'S DWARF-LEMUR.]