295—118 INDIAN TERTIARY AND POST-TERTIARY YERTEBRATA. 
individual, in which the milk-teeth were present, but had lost their crowns : the 
figured tooth was ‘ developed ’ by chiselling away the wall of the jaw. Internally 
to pm. 4 there is the base of a transversely elongated m 1 ; and as the former tooth 
shows the high crown and large middle and hind lobes characteristic of the specimens 
described above, it is probable that the specimen should be referred to the same 
species as the latter. It is also probable that a right upper carnassial of a Siwalik 
hyaena in the British Museum (No. 15,413), represented in figures 9, 9a of plate L. 
of the supplemental plates of the “ F.A.S.,” belongs to the same species. 
Mandible.— hi figure 3 of plate XXXVIII., and in figure 4 of plate XXXIX. of 
this volume, there are given two views of the hinder part of the left ramus of the 
mandible of a Siwalik hyaena, formerly in the collection of the Asiatic Society of 
Bengal, to which it was presented by Col. Colvin, and now in the Indian Museum 
(No. D. 51). The specimen is numbered 602 in the list of Siwalik fossils given by 
Messrs. Baker and Durand, 1 and is entered as Hyaena. In Dr. Falconer and Walker’s 
Catalogue of the Vertebrate Fossils of the Society 2 it bears the number S. 851, and 
is described as “Feline, — Fragment of horizontal ramus, lower jaw, right side, 
containing the two last molars in situ : would be about the size of Fells cristata, 
F. and C.” The specimen, as mentioned by Dr. Falconer, shows pm. 4 and mTl ; 
the summit of the main lobe of the former having been broken off, but the latter 
perfect and somewhat worn ; the condition of the teeth indicates that the specimen 
belonged to an adult animal. The mandible below the two teeth is quite perfect. 
The form of the teeth, and especially the conspicuous talon of mTT, leaves no doubt 
that the specimen belongs to a species of Hyaena. The carnassial is a large tooth, 
with a relatively small talon, and no vestige of a cusp on the inner side, but with a 
cingulum on part of the outer surface of the anterior lobe : it is essentially crocutine 
in form, and very like the corresponding tooth of H. felina , but distinguished by the 
slightly larger talon, and the external cingulum. Pm. 4 has a small anterior, and a 
large posterior talon : comparing it with the corresponding tooth of the large jaw of 
the latter species represented in figures 1 of plates XXXVIII., XXXIX., it will be 
found that this tooth differs by its proportionately smaller size, smaller anterior 
talon, and in that its anterior vertical ridge, instead of being on the same line as the 
hinder ridge, is placed considerably to the inner side. It will be shown below that 
the jaw is relatively less deep than in II. felina. 
In the Dublin Museum there is among the Siwalik fossils (No. 39) the nearly 
complete left ramus of a hyaena, showing the whole dentition in an early stage of 
wear ; pm. 4 alone being somewhat broken. In that specimen m. 1 and pm. 4 are 
precisely similar to the corresponding teeth of the last specimen ; pm. 3 has no 
anterior talon. The crowns of pm. 3 and pm. 4 are relatively higher than in H . felina , 
and characterized by the convexity of their external vertical contour. The interval 
between the canine and pm. 2 is remarkably small ; pm. 1 being absent, as in all the 
existing species. The jaw is relatively slender. 
l ‘ Journ. As. Soc. Beng.,’ vol. V., p. 184. 2 Page 189 ; see also “Palaeontological Memoirs,” vol. I., p. 343. 
