10 
DESCRIPTIONS OF INFERIOR MAXIL/LARY BONES 
The next specimen we shall describe is the right side of an inferior 
maxillary bone, in a remarkably perfect state of preservation, belonging 
to the cabinet of the Society. (Plate XXYIII.) 
The condyloid process in this jaw is considerably higher than in the 
M. giganteum (Plate XXIII.). The direction of the condyle also dif¬ 
fers, being inwards and backwards. 
The coronoid process appears to have risen nearly perpendicularly, 
but its anterior edge and termination are broken. The semilunar notch 
was evidently deeper in this than in the M. giganteum , though its exact 
form cannot be determined in its present injured condition. 
The posterior angle is much rounder than in the M. giganteum. 
The outer surface, where the temporal muscle was inserted, is very 
rough, being over a considerable space quite tuberculated; and there is 
a distinct semi-circular ridge of these rough elevations, as will be seen 
on reference to the drawing. (Plate XXYIII. fig. 1 , t, t', t".) Im¬ 
mediately anterior to this semicircular ridge, there is an excavation, 
distinctly striated with muscular impressions («). The ramus is 
remarkably cylindrical, and its base much more curved than that of 
the M. giganteum (Plate XXIII.). The anterior mental foramen (< 7 ) 
is smaller, and nearer to the upper edge of the jaw, than in the other 
specimens, and .the posterior mental foramen is larger than in any of 
the specimens hitherto described, its largest diameter being nearly 
nine-tenths of an inch. 
The ridge at the side of the labial groove is broken, but it appears 
to have been expanded ; whether or not, as in the M. giganteum , and 
with irregular terminations, it is of course impossible to divine. 
This specimen contains but a single tooth. This tooth is six inches 
long, and three inches and four-tenths broad. It has four denti- 
cules with two points each. The enamel on the posterior face of the 
crown is broken off, and the characters of the heel cannot conse¬ 
quently be determined. The grinding surface of the crown is some¬ 
what worn, and presents the same arrangement of enamel as in the M. 
giganteum . 
In the chin there is a small part of the alveole of the tusk remaining. 
The direction of this alveole is outwards and considerably downwards. 
It has been found impossible to give a good view of this alveole in the 
plate, but its position is marked by the dotted lines representing a tusk. 
