Characters.—Hair long, wool-like; face, hands, and feet thinly haired. Head 2½ inches long, tapering in front; muzzle prominent and blunt; ears large, pointed, and projecting above the level of the head, with short hairs, two lamellæ inside, and marginal tufts; neck short; hind-limbs slightly larger and longer than the fore-limbs; hands smaller than the feet; thumb thick, with a tubercle at base; the wrist-bone of the very rudimentary index-finger supporting two rudimentary finger-bones; third finger not parallel to fourth and fifth; the fourth longest (Fig. 7). Great toe with a tubercle at its base, opposable. Tail ¼ inch long, hidden in the fur of the body.
Fur grey at base of hairs, fawn-coloured farther up, and tipped with dark brown, uniform over the body and limbs; face darker; sides of head lighter; line from brow down the nose white. No vibrissæ on face and no eyebrows; chin, throat, inner surface of limbs, and under side of body, greyish-white.
Posterior upper molar nearly equal to posterior pre-molar, with the hind inner cusp of the crown rudimentary. Lower incisors not visible beyond the lip, cingulate; posterior molar five-cusped and relatively larger than in the next species (P. potto). Bony palate with large perforations behind the incisors. Intestines, 40 inches long; cæcum, 2½ inches.
Distribution.—The "Angwantibo," as this species is called, is known only from Old Calabar, on the west coast of Africa.
II. BOSMAN'S POTTO, PERODICTICUS POTTO.
Potto, Bosman, Beschrijving van de Guinese Goudkust, ii., p. 32, fig. 4 (1704).
Nycticebus potto, Geoffr., Ann. Mus., xix., p. 165 (1812); Schlegel, Mus. Pays Bas vii., p. 287 (1876).
Perodicticus geoffroyi, Bennett, P. Z. S., 1830, p. 109.
Perodicticus potto, V. der Hoeven, Tijdschr. v. Natuurl. Gesch., xi., p. 41 (1844); Wagner, in Schreber's Säugeth. Suppl., v., p. 183 (1855).
Stenops potto, Pel, Bijdragen tot de Dierkunde, 1852, p. 41.