188 Proceedings of the Royal Physical Society. 
Mr Carruthers says : — " It is certainly a second species of 
Perodicticus. I compared it with two stuffed specimens of the 
Potto, and, with the assistance of Dr Gray, determined that 
it was new, differing chiefly from P. Geoffroyi in its tubercle- 
like tail and large ears. I also got Mr Bennett's specimen of 
the Potto, — which is yet fortunately in spirits, — and have 
been able more completely to discriminate the differences." 
At my desire, Mr Carruthers got an artist to make sketches 
of the head of Mr Bennett's specimen of the Potto, and 
also of my specimen of the Angwdntiho, to show the vari- 
ous differences between them, in a more manifest way than 
by any lengthened description ; and as both the specimens 
have been preserved in spirits, these comparative differences 
Fig. 3. Head of Angwantibo 
are seen at a glance, no change in the original appear- 
ance of either, having been made by any attempt at skin- 
ning, or otherwise preparing them for preservation. The 
sketches are of the natural size, and Mr Carruthers mentions 
they are very accurate, and are drawn without any attempt 
to put the hair in its natural position. In this way two things 
are gained. First, both specimens are exhibited as they really 
are, without any exercise of the imagination of the draughts- 
man ; and, secondly, the outline of the skull is given in both, 
which is of much more importance than the outline of the hair, 
in animals where the hair is thick and stands nearly erect. 
The annexed woodcut (fig. 3), is the sketch of the head of the 
Angwdntibo, the other (fig. 4), that of Mr Bennett's specimen 
of the Potto. 
