180 Proceedings of the Roycd Physical Society. 
apparently, the ducts of the submaxillary gland (Wharton's 
ducts) open into the mouth. 
The Neck is rather short and slender. There is no ap- 
pearance on the back of the neck in this specimen " of the 
spinous processes of the five last cervical and first dorsal verte- 
brae, piercing through the hairy integument of the back, with 
a weak horny covering," as described by Van der Hoeven of 
the Stenops potto. 
The Limbs are very slender, and nearly equal in length, 
the hinder extremities being a little larger and stronger in 
their development than the anterior. The Fore hands 
(see fig. 1 of the annexed careful drawings, nearly the size 
of life, for which I am indebted to my friend, T. Strethill 
Wright, M.D.) are thinly covered with short hair on the 
Fig.]. Hand. , Fig. 2. Foot. 
Angwantibo. 
dorsal, and are bare of hair, or naked, on the palmar surface. 
The thumb is much larger than any of the other fingers, to 
which it is opposed. There is a large rounded, fleshy, and 
horny tubercle, nearly Jth of an inch broad at its base, 
which projects about |^th of an inch from the base of the 
thumb, on the inner side (next the centre of hand). Im- 
mediately opposed to it, and of equal size, or a very little 
larger, is another apparently simple tubercle, rising from the 
outer side (next thumb), of the base of the clustered fingers 
(see * fig. 1) ; this however, is the rudimentary index finger, 
its free extremity projecting only about Jth of an inch. It 
is supported by a short metacarpal bone, with a full and 
rounded extremity, to which are attached two small or 
