5 
OF MASTODONS, WITH REMARKS, ETC. 
inches long, and consists of a portion of the ramus of the jaw, with the 
base of the coronoid process. It contains one tooth, the posterior mo¬ 
lar. This tooth has five denticules with two points each, and a heel; 
it is six inches and nine-tenths long, and three inches and eight-tenths 
broad. 
I have the pleasure, however, of exhibiting to the society, one of 
the most perfect specimens of the lower jaw of this species, that has 
as yet been obtained. (Plate XXIII.) This jaw belongs to the Balti¬ 
more Museum. It is the one dug up by the late Mr Peale on the 
farm of Peter Millspaw, twenty miles west of the Hudson, which is 
described by Mr Rembrandt Peale in his “ Narrative of the discovery 
and exhumation of the skeleton of the Mastodon,”* and drawings and 
a description of which were communicated by Mr Peale to Baron Cu¬ 
vier, and from which the latter drew many of his characters of this 
interesting animal. When found this jaw was perfect; but about two 
years since it was unfortunately broken by accident. The largest 
fragment, consisting of the whole right side of the jaw, the coronoid and 
condyloid processes, the chin and nearly two inches of the left side, all 
i n a remarkably fine state of preservation, are represented in Plate XXIII. 
The length of this jaw is two feet six inches and a half, the height 
of the coronoid process above a line drawn along the base of the jaw 
fourteen inches and a half. 
The articulating surface of the condyloid process is divided by a 
superficial groove (x) at about two-thirds of the distance from its inner 
edge. The direction of the condyle is inwards and rather forwards. 
The coronoid process rises nearly perpendicularly; the upper part 
curves somewhat outwards; it is one inch and a half higher than the 
condyloid process. 
Just below the condyle a ridge (£) commences, which, after passing 
downwards and a little forwards a short distance, becomes nearly hori¬ 
zontal, and above this is a considerable depression, an inch in depth at 
its deepest part. 
That portion of the jaw which is covered by the masseter muscle, 
is much flattened and rough; the angle is also very rough. 
* Copied in Godman’s American Natural History, Vol. II. p. 211. 
2 * 
