DINOTHERIUM. 137 
corroborated by the remarkable structure of the 
lower jaw. 
The lower jaws of two species of Dinothe- 
rium, figured in Plate 2. C. Figs. 1. 2. exhibit 
peculiarities in the disposition of the tusks, such 
as are found in no other living or fossil animal. 
The form of the molar teeth, PI. 2. C. Fig. 3, 
approaches, as we have stated, most nearly to 
that of the molar teeth in Tapirs ; but a remark- 
able deviation from the character of Tapirs, as 
well as of every other quadruped, consists in the 
presence of two enormous tusks, placed at the 
anterior extremity of the lower jaw, and curved 
downwards, like the tusks in the upper jaw of 
the Walrus. (PI. 2. C. 1. 2.) 
I shall confine my present remarks to this 
peculiarity in the position of the tnsks, and en- 
deavour to show how far these organs illustrate 
the habits of the extinct animals in which they 
are found. It is mechanically impossible that 
a lower jaw, nearly four feet long, loaded 
with such heavy tusks at its extremity, could 
have been otherwise than cumbrous aud incon- 
venient to a quadruped living on dry land. No 
such disadvantage would have attended this 
structure in a large animal destined to live in 
water ; and the aquatic habits of the family of 
Tapirs, to which the Dinotherium was most 
nearly allied, render it probable that, like them, 
it was an inhabitant of fresh-water lakes and 
