MOLAR TEETH AND OTHER REMAINS OF MAMMALIA. 
25 
those of R. etruscus, Ealc., R. tiGhorJiinus, and R. leptorhinus, Guv. ; the presence of 
the tubercle at the entrance to the median valley distinguishes them from the upper 
molars of R. etruscus and R. deccanensis. 
The great width of the median valley, the large antecrochet, and the unusual 
size of the tubercle at the entrance, together with the wide cingulum on the 
posterior side, apart from other characters, are amply sufficient to distinguish these 
specimens from the molars of R. sumatranm and B. javanicus. 
Rhinoceros, sp. var. 
In addition to the above species of Rhinoceros, we have in the Indian Museum, 
various upper premolar and lower molar teeth which I am unable to refer to any of 
the above species, but of which I do not think it desirable at present to establish 
new species. The first of these specimens {plate 6, Jig. 6) is an upper molar, or pre- 
molar tooth brought by Mr. Fedden from Sind : the specimen is from the left side 
of the upper jaw, and is complete with the exception of the dorsum, which is broken 
away ; from its small size it is probably a premolar. 
The general shape of the crown is squared, with the postero-internal angle 
rounded off ; the transverse diameter of the tooth, when complete, probably exceeded 
the antero-posterior. The two colies are approximately equal in size, and their 
worn dentine-surfaces are directed obliquely to the median transverse line of the 
tooth, and run outwards and forwards in parallel directions ; there is a vertical groove 
on the antero-internal surface of the anterior collis {right ofjigure), 
A cingulum surrounds the greater portion of the crown ; this commences 
at the posterior valley {hollow on left of figure) as a flat-topped ridge, reaching 
nearly to the summit of the median collis {left of figure) ; it descends obliquely 
along the front of this collis, forming a waving line on its anterior surface. Between 
the two main colles {centre of base of figure) at the entrance to the median valley 
the cingulum forms a wide ledge ; this becomes narrower on the inner surface of the 
median collis, and again expands into a broad ledge along the whole of the anterior 
surface of the tooth {right side of figure). There is no distinct anterior valley. The 
median valley does not properly commence at the gap between the two colles above 
the cingulum, as is generally the case. Interiorly to the cingulum the two colles 
are connected nearly up to their summits ; on the outer side of this pass there is a 
sudden descent into the median valley ; this valley is consequently very short and 
becomes deeper as it passes outwards. A triangular crochet projects about three- 
fourths of the way across this valley ; there is no combing-plate. The posterior 
valley is somewhat heart-shaped at its summit, becoming more circular as it 
descends. The greatest length of the tooth is 1’35 inches, and the height of the 
crown ‘9 inch. 
Following my usual rule, I have not made a distinct species upon the evidence 
of this solitary premolar tooth, though I think it extremely probable that it is distinct 
from all the species noticed above. 
( 43 ) 
