SIWALIK AND NAEBADA BUNODONT SUINA. 
51—85 
those of the present specimen ; pm. i being also smaller as compared with pm. 2, and, 
judging from the figure, being separated by a considerable interval from that tooth. 
The present specimen is of far too large a size to have belonged to either of the 
other two species of Siwalik pigs. It requires, however, the evidence of the true 
molars before it can certainly be determined that it does not belong to a large race 
of S. falconeri, but it is highly probable that it does not. Should, however, later 
discoveries indicate that it does belong to that species, then there will be good 
evidence that a few individuals of the latter ranged into the Punjab. If, as seems 
probable, it is specifically distinct from S. falconeri, the present specimen indicates a 
sixth species of Siwalik pig. 
Mandible from the iNarhadas . — In plate LXX., figs. 8, 8a, of the “ F.A.S.” there 
is represented under the name of 8. giganteus the nearly complete mandible of a jjig 
from the Narbadas, which is now in the British Museum (No. 36,843). The whole 
of the teeth are preserved, m. 3 being in an early stage of wear, although fully 
protruded : the small size of the canines probably indicates that the specimen 
belonged to a female. Its dimensions are as follows, viz .: — 
Length of last five teeth . . . . 4 '6 Length of m. 2 1-0 
,, ,, three true molars ... 3-4 Width ,,,,,, 0-72 
,, ,, pm. 3 0-64 Length ,, ,, 3 1-7 
,, ,, m. 1 0-69 Width 0-89 
Width 0'53 Long diameter of canine .... 0’75 
Length of symphysis 1-0 
These dimensions indicate an animal of about the size of the female of 8. 
falconeri, and it is evident from the structure of the cheek-teeth that it is only with 
that species among the Siwalik forms that the specimen can be compared. In 
specimens of 8. falconeri with the teeth in about the same stage of wear mTiJ and m 3 
are usually longer and narrower ; and the complexity of the pattern on their worn 
surface appears decidedly greater. The inner columns of the molars of the Narbada 
jaw apparently have their inner surfaces less flattened : but the talon of m. 3 seems to 
have the same number of columns, although these are relatively smaller. The 
incisive alveoli of the specimen are less depressed below the level of the molar 
series than in 8. falconeri, and the inferior border of the symphysis is inclined more 
rapidly upwards. Although these differences appear comparatively slight, yet it is 
not improbable that they may be of specific value ; and it is highly likely that the 
fossil pig of the Narbadas may have been more closely related than any of its 
Siwalik congeners to existing Asiatic species like 8. cristatus. 
Genus II. : HIPPOHYUS, Falc. and Caut.^ 
The history of the genus is given under the head of the species. 
Species : Hippohyus sivalensis, Falc. and Caut. 
Synonym. 8us [Rippohyus) sivalensis, Falc. and Caut. 
Bistory . — Apparently the first published mention of this genus and species 
occurs in Sir R. Owen’s “Odontography”^ (1840-5), where an upper molar is 
1 In Owen’s “ Odontograpliy,” p. 562 (1840-5). It seems test on the whole, as in the analogous case of Byanarcton, to 
authenticate the genus as above ; it might, however, be given as ‘ Owen (e» Falc. and Caut.),’ in which case the same would 
have to be done with HyKnarctos. 2 Loc eit. 
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