190 Proceedings of the Royal Physical Society. 
side, of Mr Bennett's specimen of the Potto, (see woodcut, figs. 
5, 6) ; and on comparing these sketches with those already 
given of the Angwdntibo, which, for comparison, I here 
repeat (figs. 1, 2), the differences will be seen more clearly 
than could be brought out by any description. In the Ang- 
wdntibo the hands and feet are small, round, and fleshy, with 
several large pads; in the Potto they are large, flat, and thin. 
In both, as has been already carefully described, the index 
fingers of the fore hands are undeveloped ; being represented 
in the Angwdntiho by a simple tubercle (see * fig. 1.) In the 
Potto, however, as shown in the drawing, the index is not so 
like a mere tubercle, but is more developed, and therefore 
more resembling a finger, than in the Angwdntiho, (See * 
fig- 5.) 
Fig. ] . Hand. ^ Fig. 2. Foot. 
Angwantibo. 
Mr Carruthers says the tail is perhaps the most striking 
distinguishing character. I have already in the body of my 
paper sufficiently described it. 
Mr Carruthers informs me that when comparing the dif- 
ferent species of Van der Hoeven's genus Stenops, in the 
British Museum, he was struck with the great diversity of 
their general appearance, and wondered at a zoologist like 
Van der Hoeven grouping together what appeared to him to 
be several well-marked Genera. Indeed, the only explana- 
tion that occurred to him was, that Van der Hoeven intended 
to give the character of a Sub-family to his Genus Stenops. 
Mr Carruthers tells me, that while comparing the specimens 
of these two animals, he had on his table all that has been pub- 
