283—106 INDIAN TERTIARY AND POST-TERTIARY VERTEBRATA. 
These dimensions show that while the Dublin skull is about one inch longer 
than the type of H. felina , its dimensions are proportionately almost precisely 
the same, and as the two skulls agree in general form and characters, it is practically 
certain that they belong to the same species ; — a conclusion which will be confirmed 
by the characters of the teeth and mandible : it is probable that the smaller skull 
should be regarded as that of a female, and the larger as that of a male. The 
dimensions show that the proportions of the fossil skulls are very similar to those 
of II. crocuta ; the fossil race of the latter being rather larger than the Dublin skull : 
the dimensions of II. striata differ considerably. 
With regard to the dentition of the Dublin skull, it will be seen from the 
figure that this differs from the type specimen by the presence of p m. I ; the two 
agree, however, in the smallness of the interval between the canine and pm. 2 . 
The latter tooth has a large hind talon, and a smaller fore talon. In pm. 3 
there is also a large hind talon and a smaller fore talon ; and the crown of the 
tooth is set obliquely to the axis of the molar alveoli. In pm. 4 the hind lobe is 
larger than either of the others ; the respective lengths being, fore lobe 0‘38, 
middle 0-45, hind 06. In this respect the tooth agrees with Hi crocuta , but the 
first lobe is relatively ' longer, the corresponding dimensions in a tooth 1 of the fossil 
race of that species measuring 1-6, being 038, 058, and 0-8. 
Maxilla. — In figures 2, and 2a, of plate XXXV, A, of the present volume, there 
is represented a part of the right maxilla of a Siwalik hyaena 2 , in the British 
Museum (No. 37,138), showing the last premolars ; the summits of the first and 
second lobes of pm. 4 have been broken away, and the summit of pm. 3 is some- 
what abraded by wear, showing that the specimen belonged to a fully adult 
individual. At the hinder end of the carnassial, there may be seen in the bone 
(though this could not be displayed in the figure) the fang, or fangs, of a minute 
m. 1 . A comparison of this specimen with the Dublin skull, has shown that the 
two agree so closely in size and general form that there is every 'probability that 
they may be referred to the same species. The condition of the teeth of the 
isolated maxilla allows of a more complete examination than in either of the two 
skulls. In the following table the dimension^ of the teeth of the two latter are 
compared with those of the specimen under consideration. 
No. 37,138. Dublin specimen. Type. 
Length of 3 last premolars . . 3-18 3 '04 2 -82 
,, pm. 2 . . 0'76 0 72 0'67 
,, ,, 3 . . 0-94 0-86 0-85 
,, ,, 4 . . 1-55 1-5 1'37 
It will be seen that the teeth of the detached maxilla are slightly larger than 
those of the Dublin skull. The carnassial of the former agrees with that of the 
latter, in being a modification of the crocutine type ; having a larger fore lobe and 
a lower crown than in 11. crocuta , but a similarly large tubercle, extending as 
1 A specimen from the Forest-bed figured by Mr. E. T. Newton in ‘ Geol. Mag.,’ 1883, pi. X. 
2 This specimen is figured in plate L (letter), figs. 8, 8a, of the “Fauna Antiqua Sivalensis,” from which pi. XXXV, 
A is copied ; the figures being reversed. 
