MOLAR TEETH AND OTHER REMAINS OE MAMMALIA, 
9 
On the anterior side of the tooth {left of figure) a cingulum runs along the 
greater part of the surface ; the cingulum is broadest on the inner half of the 
anterior surface, and forms a distinct but shallow, and triangular anterior valley ; there 
is a gap in the cingulum at the middle of this valley : there is no cingulum along 
the inner surface of the tooth. The antero- external angle of the crown is produced 
into a very prominent process, the worn surface presenting the section of two 
arches separated by a valley, and with another valley on the inner side of the most 
anterior of the two arches ; the postero-external angle forms an acute spur. 
The dorsum of the tooth is placed obliquely to the long axis of the crown ; its 
upper half curves over towards the inner side ; posteriorly to the buttress there is no 
distinct costa on the dorsum. The worn-crown presents two fossettes only. 
The characteristic points of the teeth of this species are as follows : — 
“ Buttress at antero-external angle : single crochet ; curved dorsum and narrow 
median valley ; absence of comhing-plate, of antecrochet, and of tubercle at en- 
trance to median valley ; two fossettes on worn-crown.” 
The measurements of this specimen are as follows : — 
In. 
Length of anterior surface ... ... ... 
Ditto external surface ... ... ... 2-55 
Ditto internal surface ... ... ... 1'85 
Ditto posterior surface ... ... ... 1*95 
The presence of the buttress, of only two fossettes on the crown, and the curved 
line of the dorsum, at once distinguish the molars of this species from those of the 
preceding species. 
The molar tooth figured by Baker and Durand is remarkable for the unequal 
development of the two colles, the anterior collis being placed much nearer to the 
inner border of the crown than the median collis. 
The ultimate upper molar drawn in plate 4 {fig> 2) is from the right side ; 
it shows an anterior collis of large size ; the median valley is narrow at the en- 
trance, expands and becomes deeper as it passes outwards ; the crochet is very small 
and blunt, the median collis {on the left of the figure) is placed obliquely to the 
anterior wall {right of figure) and is confluent with the outer dentine mass, as in all 
ultimate molars. In one of Messrs. Baker and Durand’s figures of an ultimate molar 
of this species the crochet is divided at the extremity. 
In both this and the preceding species there are no combing-plates present in 
the median valley, by which the molar teeth are at once distinguished from those 
of the two next species. The presence of only two fossettes on the worn-crown 
distinguishes the upper molars of B. sivalensis from those of B. jplatyrhinus, in 
which there are three. The molars of this species have some resemblance to those 
of B.jamnicus; the buttress at the antero-external angle is, however, more pro- 
duced in the fossil species, and the dorsum in consequence is more curved : the 
cingulum is also larger on the anterior surface in the fossil species : the crochet is 
( 27 ) 
