72—38 INDIAN TERTIARY AND POST-TERTIARY VERTEBRATA. 
beyond wliich again there is a mass of agglomerated columns (c). The last tooth of 
the present specimens is further distinguished by the inner surfaces of the main 
inner columns being flatter, and by the valleys between the main columns being 
almost entirely blocked by the development of a number of small columns on either 
side of the median accessory columns (/. g.). The tooth of S. titan is still more 
markedly different in these respects than that of N. giganteiis. Compared with nv3 
of S. cristatus, which according to Rolleston is more complex than in any existing 
species of the genus, the corresponding tooth of the present specimens differs by the 
greater complexity of the portion h and c, causing the whole tooth to be relatively 
longer ; and by the columns on the median line (a, /, g) being more distinct from 
the four main columns ; as well as by the greater develoj)ment of accessory columns 
in the terminations of the transverse valleys. The simple molars of S. harbatus 
present no resemblance to the present specimens. 
In the Dublin Museum there is a detached right m. 3 of a Siwalik pig 
(No. C. 30), agreeing in all essential characters with the corresponding tooth of the 
female skull represented in plate X., although of smaller size ; its dimensions being 
l-73x0-94. 
Mandible of male. — In plate LXX., fig. 5, of the F.A.S.” there is represented 
the mandible of a large Siwalik pig, which from the great size of the canines 
evidently belonged to a male. This specimen is in the British Museum, and exhibits 
all the cheek-teeth in a well-worn condition : the inferior aspect of the symphysial 
portion is still obscured by matrix and the incisors are incomplete. From the 
circumstance that the last molar of this specimen is of a very elongated form 
(exceeding the length of the two preceding teeth) and exhibits an extremely complex 
pattern on the worn masticating surface, it may be inferred that it belongs to the 
present species. The symphysis extends backwards as far as pm. 3, and there is a 
longer interval between pim2 and the canine than in the mandible of 8. titan figured 
in plate IX. ; the canine is also relatively larger than in that specimen. The 
premolars are not well preserved, but they show that pm. 3 was of the same form as 
in existing pigs. A comparison of the figures will at once show that this sjrecimen 
is specifically distinct from the mandible of S. titan (plate VII., fig. 4) and from that 
provisionally referred to 8. giganteus (plate XI., fig. 1). 
A very similar specimen is represented in plate XXXV., fig. 4, of Baker and 
Durand’s memoir. The dimensions of these specimens will be given after the 
description of the mandible of the female. 
Mandible of female . — In plate LXIX., fig. 4, of the “ F.A.S.” there is given a 
reduced lateral view of the left ramus of a nearly complete mandible of a Siwalik 
pig now in the Dublin Museum of Science and Art, being one of the specimens 
collected by Baker and Durand. The right dentition of this specimen is figured of 
the full size in plate VII., fig. 1, of the present volume. The specimen shows all 
the teeth, which are in a well-worn condition ; but the crowns of i. 3, the canine, 
pm. Ij and pm. 2 have been broken off i the small size' of the canine indicates that the 
