130 FAUNA ANTIQUA SIVALENSIS. 
Pate IN. 
Drepanodon (Machairodus) Sivalensis (Fale. and Caut.), or fossil Dre- 
panodon, from the Sewalik hills. No description of this fossil was ever 
published, but the Sewalik specimens are referred to by Professor Owen 
in ‘ British Fossil Mammalia,’ pp. 178,179, and also in ‘ Odontography,’ 
vol. i. p. 491. A brief description of it is also given by Dr. Falconer 
in his ‘Notes on the Fossil Felis spelaa of the Mendip Hills.’ 
Figs. 1, 1 a, 16,and 1 ¢e.—Drepanodon Sivalensis. Fragment of pos- 
terior portion of skull, showing occipital condyles, foramen magnum, 
and prominent sagittal crest.—B.M. No. 39,278. 
Fig. 2.—Drepanodon Sivalensis. Mutilated specimen of cranium, 
including facial portion, but no distinct evidence of teeth.—B.M. No. 
39,729. 
Figs. 3 and 8 a.—Drepanodon Sivalensis. Fine fragment of upper 
jaw, right side, with apparently the first or deciduous dentition. The 
crown of the canine is broken off, but what remains is seen to be flat, 
and very finely serrated along the posterior edge, like a shark’s tooth. 
The tooth evidently bore the same proportion to the molar series as 
does the canine of the Felis megantereon of Bravard (Vide Owen, 
Brit. Fos. Mam. p. 178).—B.M. No. 16,350. 
The following note, from Dr. Falconer’s Note-book, dated October 2, 
1858, probably referred to this specimen and to that represented 
in fig. 5 :— 
‘In the Sewalik Machairodus the right upper carnassier is formed with a very 
thin blade. The anterior lobe is damaged, but judging from what remains it 
would seem to have been two-lobed. The middle lobe is thin and pointed; but 
neither the anterior lobe nor the middle one bears the slightest indication of 
an internal tubercle. If ever there, it is gone. Owen describes it as being there, 
** but less developed than in the normal species of Fdid@.” The posterior lobe is 
nearly horizontal and very trenchant; in fact, the tooth is compressed and sharp- 
edged. All the points rise. The length of the crown is:75 inch. There is an 
interval between the carnassier and canine of 0°8in., part of which has been arti- 
ficially rubbed down, but there is not the least indication of a fang-pit or fang. 
(Owen says there is, and that it is single-fanged and simple!) There is a distinct 
show of a double fang, fore and aft, of a tubercular ina line with the sectorial, 
behind it. The breadth of the canine atits base is 0°5in. It is very compressed. 
The posterior concave edge is finely serrated. (Owen says that both edges are 
distinctly serrated.) ’ 
Figs. 4and 4 a.—Drepanodon Sivalensis. Fragment of lower jaw with 
three premolars, the last being the sectorial. Professor Owen refers to 
this specimen in the following description :— 
‘A portion of the lower jaw of a larger Machairodus, from the Sewalik range, 
shows the begmning of the characteristic downward extension of the symphysis, and 
the depression on the outside of the ramus for the lodgment of the long upper 
eanine. The molar series, which consists, as in the typical Felines, of three pre- 
molars, the last being the sectorial tooth, has a longitudinal extent of two inches ; 
the second molar slightly overlaps the third, which has an antero-posterior extent 
of eleyen lines. This portion of jaw indicates a species of Machairodus as large 
as the Jaguar; if most probably belongs to an adult of the same species as the 
one indicated by the instructive portion of the upper jaw.’ (Fig. 3). (Owen, Brit. 
Foss. Mam. p. 179). 
B.M. No. 16,557. 
