SIWALIK AND NARBADA BUNODONT SUINA. 
53—87 
The general form of the skull is essentially that of a pig: the frontals are, 
however,, unusnall}^ flat, and the nasals wide ; while the contour of the masticating 
surface of tlie series of cheek-teeth is more convex than in any pig : the palate 
extends a considerable distance behind m. 3 . The foregoing dimensions show that in 
general size the Siwalik skull belonged to an animal considerably larger than the 
Andamanese pig ; althougli in some of its dimensions it is smaller than the latter. 
Thus the portion of the palate in front of pm. 1 is very considerably smaller than in 
8. andamanensis ; indicating that this part of the skull is considerably shorter in 
proportion to the portion behind pm. 1 than in that species of Stis, wliich is one of 
those having relatively short nasals. This shortness is caused by the small size of 
the canine (the alveolus^ of which is not larger than that of ^), and the absence of 
any diastema between it and ; the presence of which forms such a marked feature 
in all species of 8us. The canine was evidently a small incisor-like tooth, which did 
not project outwardly beyond the incisors. The third incisor (i. 3) is larger than in 
8us, and is in close apposition to the preceding tooth : bj is larger than eitlier of 
the other teeth of that series. In all these distinctive points the Siwalik skull agrees 
precisely with Hyotheriimd The anterior portion of the palate is vaulted, as in that 
genus and Bus ; but the anterior palatine foramina are apparently somewhat smaller 
than in either of those genera, and thereby make some approach to Dicotyles. 
In the Indian Museum there are two imperfect crania (Nos. B. 62, 63), collected 
by Mr. Theobald in the Siwaliks of the Punjab, agreeing in all essential points 
with the type specimen. The second of these specimens shows the excessive width 
of the nasals, and the extremely small size of the alveolus of the canine : tlie length 
of the series of cheek-teeth is only 3‘9 inches; and it is possible that these specimens 
may indicate a smaller race, or even species. 
The upper cheek-dentition is described by Sir R. OweiP in the following words : 
“Each upper true molar has its crown cleft by the common or crucial valleys, the 
transverse one passing from within forwards and outwards. Each of tlie four 
principal lobes is subdivided, not by a vertical central depression, but by a fold 
penetrating its anterior and posterior margins : the enamel at first shows additional 
minor plications ; but is worn down progressively to the simpler pattern above 
described : the outer lobes are convex externally. The first premolar is very small 
and simple, separated by an interval of its own breadth from the second : both this 
and the third have transversely compressed crowns, the fourth has a sub-trihedral 
crown.” 
In plate XII., fig. 17, there is represented a fragment of the right maxilla, 
collected by Mr. Theobald in the Siwaliks of Asnot, showing m. 2 and m. 3 , and 
belonging to an older individual than the type specimen. The last molar is fully 
protruded and partially worn ; and m. 2 about half worn. In fig. 21 of the same 
plate there are represented the corresponding teeth from a palate specimen, also 
1 This alveolus is the hollow immediately in advance of pm. 1 in the figure in plate LXXI., fig. 1, of the “ F.A S.” 
2 E.g. H. waterhqusi, vide Eilhol. ‘Ann. Sci. Geol.,’ vol. XI., pi. VI. 3 Op. cit., p. 662. 
