OF MASTODONS, WITH REMARKS, ETC. 
21 
Transactions; and I have now the gratification of exhibiting it to the 
Society, and of presenting to them the accompanying description and 
drawings. 
This specimen consists of the right half of the lower jaw, two teeth, 
the chin, and a portion of one tusk, with the socket for the other. Its 
length is two feet three inches; height, from the base of the ramus to 
the upper edge of the alveolar process, six inches. 
In general form, this bone corresponds in the most marked manner 
with two of the specimens belonging to the Society, and one of which 
is represented in Plate XXVIII. The muscular impressions and tuber¬ 
osities, at the outer and posterior portion of the jaw, are, however, less 
strongly marked in the former as was to be expected from the 
difference in age of the animals. It will be also observed, that the 
anterior and upper edge of the coronoid process projects forward in 
the latter; but it must be recollected, that that part is mutilated in 
the jaw represented in Plate XXVIIL 
The condyloid process is deficient, and the upper edge of the semi¬ 
lunar notch and of the coronoid process is slightly mutilated. 
The posterior tooth is contained in a bony cavity, at the base of the 
coronoid process, but is visible at the inner aspect of the jaw. It has 
eight points and a large talon; it is impossible, from its position in the 
jaw, to obtain correctly its admeasurements. 
Anterior to this tooth is another, possessing six points, slightly worn; 
it is four inches and nine-rtenths long, and three inches six-tenths wide. 
Portions of the sockets for the two teeth immediately preceding this 
still remain, but, unfortunately, the teeth are lost. Had they been still 
in the jaw, it would have enabled us to settle the point respecting the 
number of teeth possessed by the animal. 
The anterior surface of the chin is slightly mutilated. The plate of 
bone, forming the base of the sockets for the tusks, is deficient. The 
left alveolus is empty, the right contains a fragment of a tusk. This 
tusk extends, anteriorly, but slightly beyond the chin; it projects some¬ 
what inwardly, apparently driven in by violence; its anterior extrem¬ 
ity is smooth; its base is cup-shaped. 
The accompanying drawings are so accurate as to render further 
description unnecessary. 
6 * 
