14 
MOLAR TEETH AND OTHER REMAINS OE MAMMALIA. 
inner surface of the posterior collis. The enamel is very thin on the anterior collis ; 
over the whole of the tooth it is minutely reticulated. The length of the specimen 
is 1*6 inches, and its width 1 inch. 
A last lower molar of this species in the collection of the Indian Museum has 
the following dimensions : — 
Extreme length ... 
Width 
Height of crown 
In. 
2-95 
1-55 
1 - 4..2 
The form of this tooth is precisely similar to the figured specimen. 
The first lower molar of this species is never shown : the second is very small 
and conical ; the mandible is produced into a somewhat spatulate-formed symphysis, 
and was furnished with a pair of large triangular outer incisors, and a small central 
pair of round functionless ones. 
Rhinoceeos namadicus, Falconer, Plate 4, figs. 6 and 6. 
Ealconer assigned the above specific name to certain limb-bones of a species 
of 'Rhinoceros from the Nerbudda valley, but I believe no teeth had at that time 
been obtained. I am not aware whether these limb-bones had ever been compared 
with those of the other species of the genus. The upper molar teeth in the Indian 
Museum from the Nerbudda valley closely resemble in form those of the Siwalik 
B. platyrJiinus, though they are of much smaller size ; and it is only after consi- 
derable hesitation that I have separated the two species ; my conclusions are partly 
drawn from certain differences in the teeth, partly from Ealconer’s separation of the 
two species, and partly from the fact that almost all the Nerbudda Mammals are 
distinct from those of the Siwaliks. 
The first specimen that I have to describe is an upper molar of the right side 
{plate 4, fig. 6) ; the specimen is probably the second of the series ; it is consider- 
ably smaller than the corresponding tooth of the last species. The fangs of the 
specimen are embedded in a hard matrix ; the crown is about one-third worn down ; 
the whole of the anterior half and the inner side are complete, but the postero- 
external angle is wanting. 
The transverse diameter of the anterior collis {right of figure) is slightly 
greater than that of the median collis ; the base of the latter does not overlap that 
of the former, so that the entrance to the median valley is nearly at right angles to 
the inner border of the crown, and is but slightly curved ; v/hen the tooth is placed 
in the position of the figure, the whole of the bottom of the median valley is seen 
from the front. The anterior collis is of a regular conical form, the median collis 
is concave on the anterior side ; there is scarcely any distinct pass leading into the 
median valley, the bottom of which is of uniform depth up to the crochet ; conse- 
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