! 47 
of a male Rhinoceros. 
found in quadrupeds : indeed this muscle would have been use- 
less here ; for, from the structure of the skin, the animal could 
not be sensible to the bites of insects ; nor could so weak a 
power act upon a substance so strong and inelastic. The 
abdominal muscles were exceedingly strong, and well marked : 
the tendinous fasciae were much thicker than I had ever ob- 
served in any other animal ; obviously to give a sufficient sup- 
port to the great weight of the viscera. The incisor teeth 
were only four in number ; two situated in each jaw ; these are 
placed a considerable distance from each other : besides them, 
I observed in the head of another rhinoceros, five years old, 
and where the soft parts had been removed, two smaller teeth, 
placed one on each side those of the lower jaw ; these were not 
pointed. There were only eight of the molares, in each jaw : 
this number, of course, would be increased, as the growth of 
the maxillary bones advanced ; their form may be considered 
as peculiar, and has been already noticed by Mr. Home, in the 
Philosophical Transactions for 1799, Tab. XXI. The inside of 
the mouth presented nothing unusual ; the membranes cover- 
ing it were not thicker than those found in other graminivo- 
rous animals. The pharynx and oesophagus were large and 
capacious. The stomach, with the whole of the alimentary 
canal, was, in external appearance, very similar to that of the 
horse, only that the caecum was considerably larger ; which va- 
riety accounts for the great size of the abdomen, already noticed. 
The stomach, upon its inside, was in every part covered by a 
secreting surface ; whereas, in the horse it is partly cuticular. 
The small intestines were extremely short ; but the surface upon 
the inside was considerably extended, by the internal coat be- 
ing thrown into processes of an oblong form ; these, after the 
U 2 
