MOLAR TEETH AND OTHER REMAINS OE MAMMALIA. 
5 
fragment drawn in tlie accompanying plate, together with a figure of a complete 
premolar tooth copied from the ‘^Eauna Antiqoa Sivalensis” {plate 75,^^. 4). A 
fair idea of the general form of the upper molars may be obtained from the small- 
scale figure of a cranium in the above work {plate 70, 6). My descriptions 
are in part taken from other incomplete teeth in the Indian Museum. 
The fragment drawn {fig. 4) is a portion of the inner half of, probably, the 
second upper molar of the right side ; it exhibits the crochet, median valley, and 
portions of the adjacent colies, which are the most characteristic portions of the 
tooth. The entrance into the median valley is seen to be extremely narrow, with 
a very low pass, and no tubercle. The crochet (projecting into the valley from 
the right) is large, simple, and slightly recurved at its free extremity. In the 
present state of the tooth (about half- worn) it almost completely blocks the median 
valley ; were the tooth still more worn down, the valley would be completely 
blocked and the crown would show three pits or fossettes : one of these would be 
formed by the posterior valley, and the other two by the divisions of the median 
valley. At a still later stage of abrasion the crown would show two fossettes only ; 
this would be caused by the disappearance of the shallower portion of the median 
valley, which is placed on the inner side gf the crochet, the outer extremity of 
the median valley being much deeper than the inner. 
The anterior collis {on the left side of the figure) forms a nearly symmetrical 
blunt cone, without any " antecrochet,” projecting into the median valley opposite 
to the crochet. This collis is larger than the median collis {ofiohich a portion is seen on 
the right side of the figure)^ and the two do not overlap one another at the entrance 
to the median valley. The anterior face of the tooth is nearly straight, having a 
narrow cingulum along its internal half ; the anterior valley is scarcely defined. 
The general outline of the crown is approximately square ; the dorsum is 
almost flat, and parallel to the long axis of the tooth. This is the most character- 
istic part of the tooth, by which it is at once distinguished from the teeth of 
Rhinoceros sivalensis — the only species which it at all resembles : there is one pro- 
minent costa on the dorsum* situated about half an inch behind the antero-external 
angle ; the latter angle has another rounded costa, but is not produced into a 
buttress — another characteristic point. The costa on the dorsum does not extend 
down to the neck of the tooth ; the free edge of the dorsum rises into two very 
slight prominences, — one at the termination o£ the costa, and another at an equal 
distance from the postero-external angle. The posterior valley is large and 
approximately circular. 
The length of the dorsum of an imperfect specimen in the Indian Museum 
is 1’95 inches ; this is the only measurement I can give, owing to the imperfect 
state of our specimens. 
The premolar of the same species ( plate 4, fig. 3) belongs to the right side : 
the general characters of the tooth are the same as those of the molar, viz., the 
narrow median valley, the large anterior collis {on the right of the figure) bending 
( 23 ) 
