NOTOTIIERIUM INERME. 
287 
The genus Nototherium y founded upon some portions of 
lower jaws discovered in the bed of the Condamine River, and 
presented to the Royal College of Surgeons by Sir Thomas 
Mitchell, contains two species, both of great size, being it is 
supposed equal in bulk to the Rhinoceros. The remains in 
question demonstrate that these Mammals are distinguishable 
from species of other genora. by the angle of the jaw being 
curved inwards, and by the absence of lower incisive tusks, 
combined with a short symphynix menti, and, apparently, 
only four molar teeth, these teeth being rooted, and some of 
them at least having two transverse elevated cusps. 
Nototherium inerme. Owen. 
Of this species the College collection contains a right half 
of a lower jaw, of which the hinder part is imperfect, and a 
fragment of a second right ramus, added to which is an 
astragalus, or ankle-bone, which it is probable belonged to the 
same animal. The dentition in the most perfect portion of a 
jaw. Professor Owen observes, “ consists of molar teeth 
exclusively, four in number, which increase in size as they 
approach the posterior part of the series: a small portion of 
the anterior end of the symphysis is broken away, but there is 
no trace in that part of the socket of any tooth, and it is too 
contracted to have supported any tusk or defensive incisor. 
The length ol the jaw is 11 inches: the molar series, which 
commences one inch in advance of the posterior border of the 
symphysis, is 0 inches in extent; each tooth is implanted by 
two strong and long conical fangs, the hindermost being the 
largest, and both being longitudinally grooved upon the side 
turned to each other. The first tooth is wanting, and the 
