80—46 INDIAN TERTIARY AND POST-TERTIARY VERTEBRATA. 
more worn condition, obtained by Mr. Theobald from the Siwaliks of Leliri, Punjab. 
The corresponding portion of the opposite ramus of the same specimen was also 
obtained, but is not figured. 
In the following table the dimensions of these seven specimens, taken in the 
same order, are compared with those of the mandible of N. anclamanensis , viz . : — 
S. hysudricus. 
S. andamanensis. 
f — 
Height at m. 2 
2-0 
21 
2-3 
1-4 
Length of three molars 
3-0 
2'2 
2-75 
2-3 
,, ,, 6 cheek-teeth 
4-88 
3-5 
,, ,, pm. 2 
0-45 
0'45 
0-4 
•J 
>> • 
0-59 
0-45 
0 5 
0-65 
0-42 
Width ,, ,, ,, 
0-3 
0-44 
0-21 
Length ,, ,i 4 
0-69 
0-5 
0*5 
0-5 
0-62 
0-46 
Width ,, ,, ,, 
0-43 
0-35 
0-35 
0-5 
0 32 
Length ,, m. 1 
0-8 
0-55 
O'o 
0-64 
0-54 
Width ,, ,, ,, 
0-43 
0-4 
0-48 
0-37 
Length ,, ,, 2 
0-92 
0’7 
0 66 
0-73 
0-84 
0-65 
Width ,, ,, ,, 
0-.53 
0 5 
0-6 
0-65 
0-66 
0-46 
Length ,, ,, 3 
1-4 
1-0 
1-4 
1-35 
1-28 
M 
Width ,, „ „ 
0-5 
0-65 
0-7 
0-71 
0-53 
, , , , intermolar space 
at pm. 2 
1-3 
0-96 
The differences in 
these dimensions 
are 
not 
greater 
than those 
which migl 
occur in different individuals of the same species : the excessive length of m. 1 and m. 2 
in the first specimen is due to the large talons and early stage of wear of those teeth. 
In all the specimens the united length of m. 1 and m. 2 largely exceeds that of m. 3. 
The specimen in the sixth column (pi. VIII., fig. 3) may, from the large size of the 
premolars, be j^retty safely referred to a male. It will be seen from the dimensions 
that in this specimen pm. 3 and pm. 4 are much larger in proportion to m. 1 than in N. 
andamanensis ; this being especially marked in the case of pm. 3, whose length exceeds 
that of m. 1, instead of being considerably less : both premolars are relatively much 
wider than in the existing species ; but pm. 3 appears to have been inserted by two 
roots only. It seems that the accessory inner column [a) found in pm. 4 of 8. titan 
(pi. VII., fig. 4) is developed in the corresponding tooth of the present species. In 
some of the specimens figured in the “F.A.S.” the premolars are relathmly smaller ; 
whence it is not improbable that those specimens belonged to females. The true 
molars are very similar in structure and proportionate size to those of 8. andamanensis, 
but the crowns are somewhat lower ; and the talon' of m. 3 has its posterior portion 
[b, c) more distinctly separated from the middle accessory column (a). In the jaw 
referred to a male the molars are relatively rather wider ; but this is not the case 
with some of the specimens figured in the “ F.A.S.,” which may belong to females. 
Very similar differences obtain between the fossils and the lower molars of 8. papuensis. 
In the specimen represented in plate VIII. j %• 3, the depth of the jaw and tlie 
length of m. 1 and m72 is almost exactly the same as in the jaw of 8. cristatus 
measured on page 73 ; but the width of these two teeth is considerably greater in 
the fossil 5 while the length of mTh is much less, and that of pm. 3 and pm. 4 as much 
1 A last lower molar of S. andamanensis is figured on an enlarged scale by Rolleston, op. cit., pi. XLIII., fig. 8. 
