SIWALIK AND NARBADA BUNODONT SUINA. 
49—83 
Mandible. — The dentition of the above-mentioned mandible is represented in 
plate VIII., tig’s. 9, 9a. The specimen, which was obtained by Mr. Theobald from 
the Snyaliks of Asnot, consists of the hinder dental portion of the left ramus, and 
contains the three true molars ; of which the first is well-worn, and the third only 
touched on its anterior columns. The dimensions of the specimen are as follows, 
Length of three molars 
1-46 
Width of m. 2 . 
0-35 
,, ,, m. 1 . . ... 
0-32 
Length,, ,, 3 . 
0-61 
Width 
0-29 
Width 
0-38 
Length „ 2 
0-49 
Depth of jaw at ditto 
0-69 
The condition of the teeth shows that the specimen belonged to an adult 
animal ; and if the foregoing dimensions be compared with those of the mandible of 
N. hjsudricus given on page 80, it will be seen that the present specimen is so much 
smaller than the smallest individual of that species, that on this ground alone there 
would be every reason for referring the former to a distinct species. There are, 
however, such differences in the last molars as to render the distinctness of the two 
beyond reasonable doubt. In m. 3 of the present form the talon is relatively much 
shorter and higher than in S. hysudriciis {compare plate VIII., figs. 9a, 3a) ; its length 
being less, instead of exceeding, that of the second main column ; and its height 
being nearly equal to the latter. All the columns of the tooth are, moreover, 
relatively higher in the present specimen, and they are more closel}^ squeezed 
together. These differences in form and size are of such importance, as to leave no 
reasonable doubt of the sj^ecific distinctness of the ju'esent minute form from N. 
hysiidricus ; and it is quite evident that it cannot belong to either of the other larger 
Siwalik species.^ 
The present specimen agrees very closely in size Avith the mandible of S. 
salvanius^ ; but is distinguished by the earlier protrusion of mTS (which is exception- 
ally late in the jDigmy-hog), and by m. l and m. 2 being relatively AAudeN : the pattern 
on the worn crowns is very similar in the two forms. All other existing species are 
of far larger size. Of the fossil species mentioned on pp. 51-2 apparently the only 
one approaching in size to the present form is S. valentini, Avhich is, hoAvever, still 
larger. The lower jaw of that species is unknoAvn ; but judging from the description 
of the upper teeth it is unlikely that it should be specifically the same as the jn’esent 
form. 
Distinctness and affinities. — It appears, therefore, that the present specimen 
indicates the existence in the Siwaliks of a diminutive sj)ecies of pig, not larger than 
the existing pigmy-hog of the Nepal terai. As it cannot be identified with that 
species, and is apparently smaller than any other described form, it may be regarded 
as specifically distinct, and may be known as N. punjabiensis. 
1 The distinction between the specimen and Sanitherium uhlaginiweiti {Sus piisillus, Falc.) will be noticed under the head 
of that species. 
2 Brit. Mus., No. B. 1077a. 
3 The second molar of the fossil is both shorter and wider than iE72 of the existing species. 
