SIWALIK AND NARBADA BUNODONT SUINA. 23—57 
found that the upper and lower teeth of the two fossil jaws bear the same proportion 
to one another, as obtains between the corresponding teeth of the existing species. 
The molar teeth of the mandible under consideration agree, moreover, in absolute 
size with those of S. giganteus figured ip plate XI., the length of m. 2 being almost 
exactly the same size in both (1T6, IT) ; while in the lower jaws the pattern formed 
on the worn surfaces of the molars is as simple, and the crowns of the molars are as 
low as in the upper jaw: the length of m. 3 also exceeds to a small extent the united 
lengths of the two preceding teeth ; and the talon of the former tooth is of relatively 
simple structure. The fossil lower jaw also agrees with the cranium of N. giganteus 
in having the intermolar space absolutely less than in the smaller jaws of S. cristatus. 
All these points indicate very strongly that the mandible under consideration belongs 
to the same species as the crania described above ; and when to these is added the 
peculiar structure of the premolars of the former the probability that this association 
is correct is rendered very strong indeed. An inspection of fig. 2 of plate XI. will 
show that the mandible under consideration exhibits some very remarkable features 
in the structure of its premolars, which are unknown in any other species of the 
genus. Thus the first and second of these teeth, judging from their broken bases, 
appear to have been similar to those of other pigs : pm. 3, however, in place of being 
a narrow cutting-tooth inserted only by two fangs, as is the case in existing pigs, 
has a stout triangular crown with the apex situated anteriorly, inserted by three 
distinct fangs, as is well seen in the left ramus. The fourth premolar (pm. 4) is also 
a much wider tooth than in existing pigs ; the width of its posterior half considerably 
exceeding that of mTl, instead of being narrower: it is probable that the two hind 
fangs of this tooth were more distinctl}^ separated than in existing pigs. Now since it 
has been shown that pm- 3 and pm. 4 of S. giganteus are wider and stouter than the 
corresponding teeth of most existing pigs, it is pretty certain that the homologous lower 
teeth of that species would likewise have been abnormally large. It is true that the 
two upper premolars of N. giganteus represented in plate XI. are proportionately 
rather too short to correspond exactly with the homologous teeth of the present 
specimen ; but it is probable that p m. 4 is abnormally short in that cranium, and it 
is quite possible that the specimen may belong to a female individual. The rami of 
the present mandible indicate an animal of great strength of jaw; which is also a 
character in harmony with the characters of the type cranium : the inferior border of 
the symphysis of the mandible seems to have been much elongated. Should future 
discoveries eventually ju’ove that the provisional reference of the mandible under 
consideration to S. giganteus is incorrect, it will then follow that that specimen 
belongs to a new species. 
The structure of the two last preniolars of the present sj)ecimen is precisely 
similar to that of the corresponding teeth of Tetraconodon^ ; the only difference being 
that their size in relation to that of the true molars is proportionately much less. 
1 Vide mprci^ vol. I., pL X. 
Cjt 
