304 Proceedings of the Boyal Physical Society. 
The Body along the dorsal surface measures, from snout 
to root of tail, ^^S^^ inches ; the head, 2^Vth inches, from 
back of head to root of tail, 2/o-th inches; length from snout 
to root of tail in a straight line, S/o^h inches. The tail 
measures 4i-^th inches in length, and to the extremity of 
the hair 4^^th inches : and taken from the spirits the 
creature weighs one ounce avoirdupois. 
The Head is full and rounded, and the snout short and 
rather pointed ; it measures in a straight line IgV^h inch in 
length, by ths of an inch in greatest breadth behind the 
ears. Eyes large and full. 
There are a few scattered black bristles or longer hairs 
projecting from each side of the nose, and one or two also 
behind the eye, between it and the ear. 
The Ears are somewhat oval in shape above, measur- 
ing nearly fths of an inch in length by about /o-ths of 
an inch in greatest breadth ; they are covered with very 
short hair externally, and are nearly naked on their inner 
surface. 
There is a single transverse plate or lamella projecting 
above the auditory meatus ; it measures x^ths of an inch in 
length, by tVth of an inch in breadth or projection. Dr 
S. stated that in the Angwantibo of Old Calabar, the 
Perodicticus Calaharensis, as he designated it, which he had 
formerly the pleasure of bringing before the notice of 
this Society, the ear had two of these transverse lamellae. 
Dr J. E. Gray, of the British Museum, has since set 
apart the Angwantibo, he believed very properly, as a new 
genus Artocehus, so that it is now named the A. Cala- 
harensis. 
The limbs are covered with hair, becoming shorter 
towards the distal extremities, and extending even to the 
extremity of the distal phalanges, which are naked below. 
The hand or forefoot has the second or index finger the 
shortest, the fifth next in length, and the third and fourth 
nearly equal, but the fourth slightly the longest. 
The anterior extremities measure in length : — The arm, or 
humerus, about ths of an inch ; the forearm, or radius 
and ulna, i^ths of an inch ; the hand, to extremity of the 
