Chapter I: The Calabar Potto. Perodicticus Calabarensis

_Perodicticus calabarensis_, Smith, Proc. Roy. Phys. Soc., Edinb., 1860,
p. 172, figs. 1, 2.

_Arctocebus calabarensis_, J. E. Gray, P. Z. S., 1863, p. 150; Huxley, P.
Z. S., p. 314, pl. 28 (1864).

_Nycticebus calabarensis_, Schlegel, Mus. Pays Bas, vii., p. 287 (1876).

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 {28}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.