SIWALIK RHINOCEROTIDiE, 
47 
the inner side than in the former. The third and fourth milk-molars are very 
similar in general outline, those of B. palceindicus being mainly distinguished from 
those of B. sivalensis by their superior size. The 6 colies * in the former are, how- 
ever, of more regularly conical form than in the latter, and the third milk-molar of 
B. palceindicus does not show the small c eombing-plate 1 uniting with the 
‘ crochet,’ which occurs in B. sivalensis. The above mentioned differences, except 
in the case of the second milk-molars, are but slight, and if taken by themselves, it 
might be doubtful if they would afford grounds for specific distinction. The follow- 
ing measurements show the dimensions of the figured specimens of the milk-molars 
of the two species. : — 
Lepgth of first milk-molar 
Width of „ 
Length of second „ 
Width of „ 
Length of third „ 
Width of „ „ 
Length of fourth 
Width of „ „ 
It. palceindicus. 
.. . 1:1 
. 0-89 
. 165 
. 1-5 
. 1-9 
. 1'85 
. 2-2 
• . 1-9 
It. sivalensis. 
1:6 
1-3 
1-65 
1-6 
1-87 
1-74 
Mandible. — Specimens of the form of mandible which seems most probably to 
belong to this species are represented in plates LXXII, fig. 4, and LXXY, fig. 10 of 
the “ Eauna Antiqua Sivalensis,” under the name of B. platyrliinus : the reasons 
for assigning this form of mandible to the present, species have been already given 
under the head of B. sivalensis. A smaller-sized drawing of one of the speci- 
mens alluded to above is given in the “ Palaeontological Memoirs.” 1 This form of 
mandible very closely resembles the mandible of B. indicus, both in its dentition 
and shape. The symphysis is thicker, and less channel-shaped in the middle than 
in B. sivalensis and B. javanicus. The first premolar seems to have been shed at 
an early date. 
The dimensions of the specimen figured in plate LXXII of the * Eauna An- 
tiqua Sivalensis ’ are as follows, in inches : — 
Length of fragment ...... 
Breadth of symphysis 
Length of „ interiorly .... 
Depth of jaw. 
Thickness of jaw 
Length of four anterior molars 
Interval between incisive alveolus and; molar series . 
Width between posterior molars .... 
,, „ anterior „ . . . . 
13-5 
5-7 
7-0 
4-7 
33 
7-4 
3- 1 
4- 0 
3'4 
The specimen figured in plate LXXV of the “ Eauna Antiqua Sivalensis ” is 
referred to' in the description of the plates of that work as follows : — ■“ Lower jaw, 
right side, and symphysis, containing very large outer, and small inner incisor of 
Yol. I, pi. XIV, fig. 4. 
