28 
MOLAU TEETH AND OTHER REMAINS OE MAMMALIA. 
The ultimate premolar is larger than the other ; it resembles the penultimate, 
with the exception that the costa on the dorsum is placed, not mesially, hut close 
to the antero-external angle. Its measurements are — 
External side 
1-8 
Internal side 
1-3 
Anterior side 
1-7 
Posterior side 
As these teeth belong to the premolar series, which is subject to considerable 
variations in the same species, it would not he safe to found a new species upon 
their evidence alone, although I doubt if they can he referred to any of the 
described forms : Mr. Eoote considers them as belonging to a second Burmese species. 
The premolars of Rhinoceros iravadicus, as in the recent Rhinoceros suma- 
trensis, probably had a buttress at the antero-external angle, were nearly quadrate 
in form, and had a wide open valley, without any combing-plate. 
A figure of the premolar of Rhinoceros palceindicus is given on plate 4, figure 
8, which will be seen to have no resemblance to the present specimens ; the ulti- 
mate premolar of that species has but one costa on the dorsum and no combing- 
plate. 
In plate 73, figure 26, of the “ Eauna Antiqua Sivalensis,” the premolars of 
Rhinoceros sivalensis are shown : they are quite quadrangular in form, with no very 
prominent costa, no combing-plate, a narrower valley, and only two fossettes on the 
worn-crown. 
With Rhinoceros platyrhinus the present specimens are connected by the 
presence of a combing-plate : this, however, is the only point in common. The pre- 
molars of Colonel Baker’s specimen of R. platyrhinns in the British Museum are 
double the size of the present specimens, are more quadrangular in form : they have 
two costse on the dorsa of the whole of the series, and their external border is quite 
straight and never like that of the second of the present specimens ; while the comb- 
ing-plate and crochet are of much larger proportionate size, and closely approxi- 
mated. 
The premolars of Rhinoceros deccanensis are distinguished by the cingulum 
encircling the whole of the internal surface. 
The same remarks apply to Rhinoceros planidens as to R. iravadicus. 
We do not know the form of the premolars of Rhinoceros namadicus, though 
they no doubt had a combing-plate, and were somewhat oblique. The specimens 
might possibly belong to that species, though the distance of the localities and the 
difference of the age of the beds in which the two specimens occur tells somewhat 
against it. 
The specimen drawn in plate 6, figure 10, is from Siwalik strata, and is in the 
collection of the Asiatic Society of Bengal; it belongs to the right maxilla of a 
species of Rhinoceros. As there is no disc of pressure on the anterior side it is pro- 
( 46 ) 
