_Nycticebus bengalensis_, Geoffr., Ann. Mus., xix., p. 164 (1812). _Nycticebus javanicus_, Geoffr., t. c. p. 164 (1812); id. Cat. Primates, p. 78 (1851); Schl., Mus. Pays Bas, vii., p. 286 (1876). _Nycticebus tardigradus_, Fischer, Syn. Mamm., p. 71, no. 2 (1829); Is. Geoffr., Cat. Méth. Primates, p. 78 (1851); Blyth, Cat. Mam. As. Soc., p. 18 (1863); Schl., Mus. Pays Bas, vii., p. 285 (1876); Anderson, Cat. Mamm. Ind. Mus., p. 94 (1881); Blanf., Faun. Brit. Ind. Mamm., p. 44 (1888). _Stenops tardigradus_, Van der Hoeven, Tijdschr. Nat. Ges., xi., p. 39 (1844); Wagner in Schreb., Säug. Suppl., v., p. 151 (1855). _Stenops javanicus_, Van der Hoeven, _op. cit._, p. 40 (1844); Wagner, _op. cit._, p. 152 (1855). _Nycticebus cinereus_, Milne-Edw., Ann. Mus., vii., p. 161 (1867); id. N. Arch. Mus., iii., p. 9, pl. 3 (1867); Anderson, Rep. Zool., Yun-nan, p. 103 (1879); Schl., Mus. Pays Bas, vii., p. 286 (1876). _Lemur menagensis_, Nachtrieb, Zool. Anz., xv., p. 147 (1892). (_Plate III._) CHARACTERS.--Body larger and fuller than in _Loris_, and covered {34}with close and woolly fur. Head short and round. Eyes large, set close together, and having a gentle expression; face short and flat; muzzle less projecting than in _Loris_; ears small, rounded, hairy, and nearly buried in the fur; neck short; tail invisible externally. Limbs short; index-finger small, containing three bones; toes remaining spontaneously contracted after death. Top of skull with prominent crests, globular behind; facial bones conspicuously projecting in front; orbits large, their inner margins separated from each other by a narrow flat space. Pre-maxillæ not produced far in front; hind border of bony palate not extending backwards beyond the median molar. Of the upper teeth, the inner incisor larger than the outer, one often absent on each side; canine vertically very long, with a gap between it and the anterior pre-molar; anterior pre-molar elongate, the posterior differing considerably from the anterior molar, and having a short cusped heel behind; posterior molar with a three-cusped crown. Teeth of lower jaw agreeing with those in the diagnosis of the family (_suprà_, p. 24). Vertebræ in dorsal and lumbar regions together 23 or 24. The long flexor muscle of the thumb, so characteristic of the Anthropoid Apes, is present in _Nycticebus_. The interlacement of the tendons of the muscles of its foot (according to Huxley and Murie) closely resembles the arrangement in the higher Primates. The long flexor muscle of the toes (_flexor longus digitorum_) is very large, and has one important origin on the lower end (internal condyle) of the thigh-bone correlated with the powerful grasp of its hind-limbs. The female bears one young at a birth.