MOLAR TEETH AND OTHER REMAINS OF MAMMALIA. 
7 
The upper molars of this species somewhat resemble those of the European 
R. leptorhinus, Ouv. {R. megarhinus, ChristoL), in having the dorsum nearly straight 
and without a buttress at the antero-external angle. The molars of the Indian 
species are, however, at once distinguished by having three fossettes on the worn- 
crown, whereas those of the European species have only two ; further, the two 
colies are more equal-sized in the former, and the median valley is much narrower 
at the entrance than in the latter. The molars of R. leptorhinus are further 
distinguished by a small combing-plate. R. hemit<schus, Falc., also has its upper 
molars with a straight dorsum ; and the two colles are in close opposition, as in 
R. palceindicus : the teeth of the former are, however, sufficiently distinguished 
by never showing more than the two fossettes on the worn-crown, and by having 
a small combing-plate. 
From the molars of R. sumatrensis and R. javanicus those of the present 
species are distinguished by having three fossettes on the crown-surface instead 
of only two. 
The upper molars both of this species and of R. indicus present three fossettes 
on the worn-crown, but the fossettes are formed in a different manner : in the 
present species the two fossettes in the median valley are formed by the valley 
being divided by the crochet ; in R. indicus the two fossettes are formed by the 
union of the crochet and the combing-plate ; the molars of R. palceindicus have 
no combing-plate. The same remarks apply to the molars of R. tichorliinus, (Ouv.), 
which are formed on the same plan as those of R. indicus. 
A figure of the lower molars of this species will be found in the Fauna 
Antiqua Sivalensis ” {plate 75, fig. 2) ; they are characterised by having the 
posterior valley considerably larger and deeper than the anterior valley, so that 
the latter becomes completely obliterated at an early period of w^ear. The median 
collis is the larger of the three, and the limited dentine surfaces of this and the 
anterior collis form a complete semicircle. 
The lower molar figured in the accompanying plate (plate 6, fig. S) seems to 
belong to this species ; it was brought by Mr. Fedden from the Manchhar (Siwalik) 
beds of Sind. The tooth is from the left ramus of the mandible, and is about one- 
third worn down. The posterior collis (left of figu^^e) is small, and has its dentine 
surface placed obliquely to the long axis of the crown ; the inner extremity of this 
collis is rounded and narrow ; the posterior valley is of considerable depth and 
size with a wide open entrance; it would not be obliterated until the crown became 
worn down almost to its base. The median collis (centre of figure) forms by far the 
greater part of the worn-crown surface ; its inner wall is flat and vertical, and angulated 
next the posterior valley ; the anterior boundary of the posterior valley forms a wall 
of enamel running nearly at an angle of 45" to the long axis of the tooth ; on the 
outer side there is a marked angulation in the enamel wall of the anterior moiety 
of this tooth; the anterior collis (right of figure) is very small, though it extends 
to the inner border of the tooth ; the anterior valley is very small and shallow, and 
( 25 ) 
