293—116 INDIAN TERTIARY AND POST-TERTIARY YERTEBRATA. 
the other teeth of those forms and of the present skulls not being' then known. 
With regard to the difference in the size of m. 1 in the two specimens, it will be 
noticed that the transverse diameter of this tooth on the left side of the second 
specimen is 0'48, while in the first it is OB ; .giving a difference of 0T1. The 
extremes in the size of the corresponding tooth in II. striata 1 are 0'49 and 0*58, or a 
difference of 0*09 ; indicating that the difference in the two specimens under 
consideration need not indicate more than individual variation. The true molar of 
the second specimen is readily distinguished from the corresponding tooth of the 
type of H. felina (in which alone this tooth is visible), by being provided with three 
distinct roots (in place of one or two), as in U. striata ; the largest of which is placed 
on the inner side, and is totally wanting in H. crocuta and H. felina. Again, the 
true molar of the skull under consideration is placed with its inner border at the 
same distance from the median line of the palate, as in the first specimen, and is not 
squeezed close up to the carnassial as in II. felina. The carnassial of the second 
specimen may have been slightly smaller than that of the first specimen. The 
second premolar ( 'compare pi. XXXV., fig. 1, with pi. XXXVA., fig. 2) differs from 
the corresponding tooth of H. felina by its more oblique position, its shorter and 
broader crown, and by the presence of a well-marked cingulum on the inner side of 
the posterior extremity. It closely resembles the corresponding tooth of E. crocuta , 
but is more obliquely placed. The incisors both in this and the first skull are smaller 
than those of H. felina ; the third of the series being distinguished from the detached 
specimen referred to that species by the presence of a conspicuous inner cingulum. 
The profile of the skull under consideration has not attained its adult form. 
Maxillce. — In figures 1 , la, and 3, 3a, of plate XXXVA. there are represented 
two specimens of detached left maxillae of Siwalik hyaenas, 2 in the British Museum, 
the teeth of which agree so nearly with those of the first skull described above as 
probably to be within the limits of individual variation. The former specimen 
(No. 37,139) shows pm. 3 and pm. 4 ; m. 1 having probably been broken away: the 
carnassial in this specimen is unusually long, and exhibits the crocutine characters 
of a long third lobe, and the forward position of the tubercle : the third lobe is as 
long as in an equal-sized tooth of II. crocuta , but the middle lobe is smaller, and the 
width across the tubercle less. The ridges of pm. 3 are more approximated than in 
the type skull, but this character appears somewhat exaggerated in the figure, owing 
to the more outward inclination of the tooth, probably due to crush : the inner 
cingulum is well displayed. 3 In the second specimen (No. 37,140) mj. is present, 
and is a transversely elongated tooth, as in the type skull. The third lobe of pm. 4 
is relatively smaller than in H. crocuta ; and its tubercle is placed well forward ; the 
1 Taken from Mr. Busk’s tallies and the specimen of which the dimensions are given above. 
2 These figures have been copied (but reversed) from supplemental plate L., figs. 7, 7a, and 8, 8a, of the “Fauna 
Antiqua Sivalensis.” 
3 The want of this cingulum through fracture in the type skull also tends to make the vertical ridges appear abnormally 
far apart. 
