287—110 INDIAN TERTIARY AND POST-TERTIARY YERTEBRATA. 
and consist of pm. 3, pm. 4, and m. 1, the talon of tlie latter being still concealed by 
matrix : the base of pm. 2 is also shown. In the following table the dimensions of 
this and the last specimen are compared with those of the three typical mandibles of 
I 
m 
Length of series of cheek-teeth . . . . 3T 
,, ,, pm. 2 0-59 
Width ,,,,,, 0-36 
Length ,, ,, 3 0"75 
Width „ „ „ 0-54 
Length ,, ,, 4 
Width „ „ „ 
„ m. 1 1-04 
Depth at ,, 1’56 
Interval between canine and pm. 2 .... 0-39 
The gradations in these measurements are such that no distinctions on this score 
can be drawn between any of the specimens. In D. 50 pm. 4 is relatively 
narrower, and the cingulum on the inner side of the hind talon more marked than 
in D. 102. The squared form of pm.,3 is very constant in all the specimens in 
which it can be well observed ; and it seems advisable to provisionally refer all the 
five specimens to the same species, although there may be some doubt with respect 
to D. 50. 
The specimen of an immature mandible of a Siwalik hysena represented in 
figures 7, 7a of plate M. of the u F.A.S.” (B. M. No. 37, 140), 1 and also the specimen 
of a distal extremity of a mandible represented in figures 3, 3a of the same plate 
(B. M. No. 16,584), may not improbably be referred to the present species. 
Distinctness and affinities. — Summing up the results of the foregoing descriptions 
and comparisons it will be apparent that H. felina is more nearly allied to 17. crocuta 
than to either of the other existing hysenas ; but is readily distinguished by the 
different form and position of the upper premolars, the larger size of pm. 4 and its 
talons, the form of the occiput, the occasional absence of pm. 1 , and the 
approximation of the canine and p m. 2 . In those points in which it differs from 
II. crocuta it makes a step in the direction of the less specialized II. brunnea and II. 
striata ; from both of which it is, however, in most respects widely different. 
With regard to the extinct species mentioned in the list on pp. 276-7, if the 
small size of m. 1 be constant in II. felina , the only species (besides II. crocuta ) with 
which it could be closely allied would be R. perrieri , which is probably the same as 
II. crocuta , and, therefore, differs from If. felina in the same points as the latter. If, 
however, the small size of m. 1 be not constant in H. felina , that species might be 
0-62 
0-42 
0-75 
0-54 
0-82 
0- 50 
1- 01 
1-73 
0-78 
0-54 
103 
0‘65 
0- 76 
1- 22 
l This specimen has been referred io the Fdidcc ; see “ Palieontological Memoirs,” vol. I., p. 549. 
