217—40 INDIAN TERTIARY AND POST-TERTIARY VERTEBRATA. 
inner tubercle, placed opposite the hinder lobe* of the blade ; of which the foremost 
lobe carries a distinct cingulum. The first true molar ( m. 1 ) is a nearly square- 
crowned tooth ; and m.2 is relatively short. In the following table the dimensions of 
the teeth of the specimen are compared with those of the teeth of TJ. torquatus , TJ. arctos 
(var. isabellinus ), and TJ. liorribilis : the dimensions of the first are taken from a small 
skull belonging to the author : those of the second from (a) 'a small skull belonging 
to the author, and (b) from Mr. Busk’s tables 1 ; those of the third are from the same. 
! I i 1 
P P p p 
a. b. 
Length of 3 last cheek-teeth ..... 2-44 .. 2-31 .. 2-53 
„ „ pm. 4 0-65 .. 0-47 .. 0‘58 0-65 .. 0-67 
Width „ „ „ 0-53 .. 0-32 .. 0 46 0‘45 .. 0-5 
Length,, m. 1 0'74 .. 0-78 .. 0'75 0-9 .. 0-9 
Width „ „ „ 0-71 .. 0-62 .. 0-59 0-6 .. 0-7 
Length,, „ „ 1'06 .. 1'09 .. 1-3 p44i .. 1*5 
These dimensions show that the fossil differs from TJ. torquatus by the greater 
relative size of pm. 4 , and the larger development of its tubercle ; and also by the 
greater proportionate width of mj. : the two agree in the relative shortness of m. 2 . 
From TJ. arctos the specimen is readily distinguished by the proportionate shortness 
of m.2; the carnassials of the two are more equal in size, but that of the fossil is 
somewhat wider, and has its tubercle placed still further back. From TJ. liorribilis 
the fossil is distinguished by the relatively greater width of m. 1 • by the shortness 
of m. 2 ; and by the tubercle of pm. 4 being placed entirely behind the division 
between the two lobes of the blade, instead of in the middle of the same. 
Ursus americanus is distinguished by m. 1 being relatively longer and narrower 
(0*73x0'54), and by the tubercle of pm. 4 being placed in the middle of the tooth. 
TJ. arvernensis is also distinguished by the more elongated form of m. 1 , and still more 
completely by the form of pm. 4, in which the tubercle is small and placed in the 
middle : it is also distinguished by the presence of a distinct interval between pm. 3 
and pm. 4 , which teeth are seen from the original figure to have been closely 
approximated in the fossil. TJ. etruscus is distinguished by the elongated form of 
pm. 4 (0‘72x0'5) ; by the larger size of m. 1 (0-98x0-81); and the distinct interval 
between pm. 3 and pm. 4. TJ. japomcus is at once distinguished by its smaller size, 
and the complete absence of any tubercle to pm. 4 . In TJ. malayanus the whole 
molar dentition is absolutely smaller than in the fossil, the length of the three last 
teeth being only F9: it is also readily distinguished by the smaller extent of the 
backward prolongation of m. 2 , this tooth being but slightly larger than m. 1 : the 
following measurements show these differences : — 
Zool. Soc.,’ vol. X., pi. XXVII. 
