On the Angwantibo of Old Calahar. 189 
In pointing out the various specific differences which the 
comparison of the two specimens make manifest, Mr Carru- 
thers says, in the Angwantibo the body and limbs are more 
slender than in the Potto, and the colour of the hair is 
more uniform. The head is longer and narrower, with a more 
produced muzzle, larger rnouth, and more prominent eyes ; 
while in the Potto (see woodcut), the head is nearly round, 
and has a much less projecting muzzle. Again, the ear is 
larger, and directed more upwards and forwards in the Ang~ 
wdntiho ; and there are two folds, as already pointed out, 
in the inner surface of the ear ; while there is only one in 
the Potto, The drawings show also the remarkable differ- 
ences in the teeth. The teeth in the lower jaw, which 
Fig. 4, Head of Potto. 
Bennett described as the canines in the Potto, but which 
are now considered as pre-molars, are mentioned by him as 
having cutting surfaces, both before and behind, they are, 
in fact, small, flat, triangular teeth ; whereas in the Ang- 
wantibo they are long, rounded, and more canine-looking. 
Then the six teeth in the front of the lower jaw, in the Ang- 
wantibo, are small and hyaline, not visible above the under 
lip ; while in the Potto they are large, prominent, and pro- 
jecting (see woodcuts), and of the same colour as the molars. 
There is also a very striking difference in the hands of the 
two little animals. Mr Carruthers has been good enough to 
make the annexed careful sketches, the size of life, of the 
hand (fig. 5), and the foot (fig. 6), both belonging to the left 
VOL. II. 2 B 
