592 ON ARCTOCEBUS CALABARENSIS 
limbs is also lighter, as well as the whole under surface of the body ; 
the grey hairs having their distal half of a light fawn colour, and in 
some places nearly white. The specimen having been for a long 
time preserved in spirits makes it a little difficult to get at the minute 
details of colour. There are no stripes or markings on the back, or 
other parts of the body, to be observed on this animal, as on the 
Stenops tardigradus of the East Indies—its general appearance being 
more uniform over the surface, although somewhat mottled in 
character, from the hair varying in colour at base and apex. 
“The body of the Angwantibo is slender, and measures 10} inches 
in length from the point of the muzzle to the extremity of the very 
short tail, which is completely hid in the long fur of the body, and 
measures only about }th of an inch in length. This animal is a 
male, the penis, which is supported apparently by a small bone, 
projecting upwards and forwards from the rounded scrotum. 
“The head is oval and rounded, tapering rapidly in front of the 
eyes: the muzzle protruded, full or blunt, and rather prominent. 
The breadth of the head in front of the ears is about 14 inch; in 
front of the eyes about #ths of an inch. The length from the mesian 
line of the nose to the anterior part of the meatus of the ear is 
12 inch ; from point of nose to anterior angle of eye is #ths of an inch; 
from anterior angle of eye to point of opening of ear 14 inch, the 
total length of head from muzzle to back part being nearly 24 inches. 
“The eyes are rather full and large, the opening of the lids mea- 
suring 4 an inch in length; the distance between the eyes at their 
anterior angles is } an inch. They are rather prominent forwards, 
and very slightly lateral. 
“The ears are erect and patulose, rather large and rounded in 
outline, without emarginations, measuring about #ths of an inch 
across from before backwards, and also from above downwards ; they 
seem to be naked internally, and slightly covered with short hair 
externally. In this specimen they are nearly naked, especially on 
the inner surface. There are two transverse abrupt parallel project- 
ing ridges of cartilage, each measuring ;‘;ths of an inch in length, 
in the free cartilage above the external opening of the meatus. 
“The external openings of the nostrils are rather lateral, and are 
sinuous, curved upwards and inwards towards the median line of the 
full and rounded snout ; and there is a groove between them running 
down to the front of the upper lip. 
“The tongue is long and rounded in front, and rather rough, 
being covered with small papilla. Immediately below the tongue is 
the projecting lamina, covered with a horny cuticle and resembling 
