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 Angwantibo, 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 

 Angwantibo, the other (fig. 4), that of Mr Bennett's specimen 

 of the Potto. 



