1864.] PROF. HUXLEY ON ARCTOCEBUS CALABARENSIS. 319 
Dr. Smith’s description of the nostrils and of the snout fits the 
present specimen very well; but not so the figure given at page 188 
of his paper, in which the snout is far too blunt, and the nostrils 
have too little curvature. Of the tongue I shall speak fully by and 
by ; in general it agrees with Dr. Smith’s description. 
The spinous processes of the cervical vertebree do not project in 
the manner described by Van der Hoeven in the Potto, though 
they can be readily felt through the skin. Dr. T. Strethill Wright’s 
figures of the hand and foot of Dr. Smith’s Angwantibo would very 
well represent those of the present specimen ; nor need any modifica- 
tion be made in the description of those parts. I may remark, 
however, that short hairs are developed upon the dorsal surface of 
the distal phalanges, as of the rest. 
The disposition of the hands and feet and of their digits, however, 
calls for some special notice. 
All the digits were strongly flexed. The exertion of a considerable 
force was necessary to extend them; and when that force was re- 
moved, they at once returned to their flexed attitude. Left to itself, 
the hand assumes the prone position, with the thumb inwards, the 
fingers outwards ; under like conditions, the dorsum of the foot is 
turned as much outwards as upwards, and the fibular edge of the 
metatarsal region downwards (fig. 2, B). 
The distal part of the foot can be so rotated that the dorsal region 
of the metatarsus is turned completely upwards and completely out- 
wards ; but, left to itself, it returns to the position just described. 
Fig. 2. 
A. The left hand: the digits artificially extended as far as they will go. 
B. The left foot in its natural position, seen from without. 
C. The same, seen from below. 
