335—158 INDIAN TERTIARY AND POST-TERTIARY YERTEBRATA. 
giving the following characters to the species, viz. : — “ TJn peu plus grand que la M. 
macrocelis [meganthereon] ; la canine est mediocre; la premiere molaire inf erieure sans 
denticules et petite; la dilatation sijmphysaire tres-grande ; ” In 1862 Prof. Gaudry 1 
mentioned the Siwalik form under the name of M.falconeri. In the “ Palaeontological 
Memoirs,” 2 published in 1868, certain remains of the Siwalik Machcerodus in the 
British Museum, previously figured in unpublished plate N. of the “ F.A.S.,” 3 are 
named Drepanodon (. Machcerodus ) sivalensis, F. and C.: two of the specimens being 
figured in the first volume 4 ; and a note by Dr. Falconer added. 5 In 1880 Mr. Bose 6 
described the Siwalik machserodonts in the British Museum, and referred them to 
two species, under the names of M. sivalensis , F. andC., and Bose, and M. palceindicus, 
Bose : some of the specimens on which the latter was founded having been added to 
the National Collection after the death of Dr. Falconer, and others having been 
included in Mi sivalensis. Later on in the same year the present writer expressed 
his opinion 7 that these two species were not distinct ; the differences between the 
remains on which they were founded being due to sex or age. Mr, Bose 8 subsequently 
reasserted his own views ; which, from being confirmed by specimens recently 
examined by the present writer, are now adopted. 
It will thus be seen that the name Machcerodus falconeri (Pom.) has the priority 
over M. sivalensis. Since, however, no figures were given with Pomel’s notice, which 
is exceedingly meagre and insufficient, while Falconer’s name has met with very 
general acceptation, it seems better that the latter should be adopted. 
Type mandible. — Since the characters of the lower jaw show more clearly than 
the other remains the distinction between the present and the next species, it will be 
better in both cases to commence with the description of the 'mandible. In figures 
4, 4a of plate XLIY. there is represented a part of the left ramus of the mandible 
of a Siwalik Machcerodus in the British Museum, named M. sivalensis in the “ F.A.S.” 9 ; 
which may be taken as the type specimen. This jaw is the one alluded to by Prof. 
Owen 10 as indicating a species as large as the jaguar ; and shows pm. 4, m. 1, and the 
broken base of pm. with the commencement of the descending sympliysial 
expansion. The latter commences a short distance in advance of pm.’ a ; and 
descends very rapidly, with a straight inferior border, indicating that when complete 
the whole expansion was large. The first tooth (pm. a) is inserted by one fang, and 
must have been relatively small : pm. 4 is remarkable for the height and extreme 
backward inclination of its crown : it slightly overlaps m. i, and has large fore-and- 
aft talons ; the latter being biscuspid. The carnassial is of the normal type ; with 
a very large posterior lobe. 
Second specimen. — In figure 5 of the same plate there is represented a fragment 
1 “ Animaux Fossiles et Geologie de l’Attique,” p. 113. 6 ‘ Quart. Journ. Geol. Soc.,’ vol. XXXVI., pp. 122-5. 
2 Vol. I., p. 550. 7 ‘Eecords,’ vol. XIV., p. 63. 
3 Preserved in tlie British. Museum, and now reproduced in autotype. 8 Ibid, p. 266. 
4 Plate XXV., figs. 5 and 6. 9 Plate N., figs. 4, 4a. 
5 “ Pal. Mem.,” vol. II., p. 456. 10 “ Brit. Foss. Mamm. and Birds,” p. 179. 
