1864.| PROF. HUXLEY ON ARCTOCEBUS CALABARENSIS. 315 
This specimen my friend Mr. Murray was kind enough to trans- 
mit to me for examination, some two years ago; but I have unfor- 
tunately been prevented by the pressure of other occupations from 
undertaking the investigation until now. 
The most important passages in Dr. Smith’s description of his 
specimen, which, like mine, is of the male sex, are the following :— 
“The Angwantibo is covered with a thick and long wool-like 
hair, which becomes short and thin on the face and on the extremi- 
ties, the inner sides of the fore and hind hands being free from hair. 
The hair is of a dark grey colour at the base, and the upper third, or 
so, of its length is of a light brown or fawn-colour, the terminal points 
being of a darker brown ; this is the general character of the fur of 
the upper parts of the body and limbs. The face in front of the 
eyes is rather darker in colour ; but the sides of the head are lighter, 
and the chin and throat are nearly white. The inner surface of the 
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 mi- 
nute 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 104 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 ofthe body, and 
measures only about ith 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 1} 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 
1} inch ; from point of nose to anterior angle of eye is 3ths 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 23 inches. 
‘* The eyes are rather full and large, the opening of the lids mea- 
suring 3 an inch in length; the distance between the eyes at their 
anterior angles is 3 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 3ths 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 ;4,ths of an inch in length, 
in the free cartilage above the external opening of the meatus. 
