74—40 INDIAN TERTIARY AND POST-TERTIARY VERTEBRATA. 
Since Falconer’s notice the anterior wall of mT^ has been broken way. The inner 
aspect of m. a is represented in fig. 9 of the same plate. A larger fragment of the 
corresponding ramus of another mandible, from the Siwalik Hills, containing the 
three true molars, is represented in plate LXXI., fig. 15, of the “ F.A.S.” under the 
name of S. p^anteus, and is preserved in the British Museum (No. 16,612). In that 
specimen the cheek-teeth are in nearly the same condition of wear as the mandible 
represented in plate VII., fig. 1, of the present volume, and the length of mTS 
exceeds that of the two preceding teeth. Since the molars of all three specimens 
agree exactly in the complex pattern formed on their masticating smfaces, in their 
elongated shape, and in the long talon of the last tooth ; while the teeth of the 
British Museum specimen agree almost exactly in size with those of fig. 1, those of 
fig. 2 being somewhat larger, the whole of the three specimens evidently belong to 
the same, or a closely allied, S2)ecies. 
Comparing the molars of the specimen represented in fig. 2 with those of S. 
titan represented in fig. 4 of the same plate (the degree of wear of the latter being 
very slightly less than that of the former), it will be seen that the pattern of the 
worn surface of m72 is much more complex in the present specimen ; the transverse 
valley on the outer side being entirely obliterated by the detrition of the outlying 
columns situated therein ; the whole crown is moreover relatively longer and 
narrower. In m. 8 the distinctive characters of the two forms are, if possible, still 
more distinctly displayed. Thus the talon of that tooth in the present specimen has 
the median column («) corresponding to that of S. titan ; in the portion b and c the 
inner column is, however, more developed, being as large as the outer column ; w4nle 
behind these there is the portion d which is entirely wanting in S. titan. The main 
columns in the present species are flattened on their lateral surfaces ; and the lateral 
accessory columns are so developed as to almost completely block the outer 
terminations of the transverse valleys ; this being especially noticeable in the first 
valley. On the inner lateral surface (figs. 9, 10) it will be seen that the columns of 
the present species are relatively taller and wider, with their summits inclining 
forwards in place of being nearly vertical, and with much narrower sjDaces between 
them : the talon [the ])ortion to the right of ta) is equal in length to the whole length 
of the rest of the crown, instead of only to half, and its first column is as high as 
the column immediately anterior to it : finally the whole crown is relatively higher. 
In the following table the dimensions of the specimen represented in fig. 2 are 
compared with those of the British Museum specimen, and with those of the 
corresponding teeth of 8. titan., viz . : — 
Present species. S. titan. 
Length of m. 2 
Ind. Mus. 
Brit. Mus. 
0-95 
1-42 
Width ,,,,,, 
0-71 
0-7 
10 
• • • • • • 
2-4 
1-8 
2-16 
Width „ „ 
0-85 
0-7 
12 
Height of first inner column of talon of ditto 
1-05 
0-7 
These dimensions and comparisons, coupled with the totally different form of 
