SIWALIK AND NARBADA BUNODONT SUINA. 
43—77 
extremely complex one of PhacocJimrus. In the “ Enchainements Prof. Gaudry 
remarks : — “ Le genre 'pliacocliere a pu, comme celui cles liippopotames^ etre cite parmi les 
formes qui sont isolees dans la nature actuelle^ mais M. Tournouer nUa montre dernierement 
cles molaires cVun sanglier fossile recueilli en Afriqiie dans la province de Constantine, ou les 
denticides se midtiplient et se separant les ims cles cadres, de manure a indiquer une tendance 
vers la forme singidiere des phacoclieresP This African form, which the writer believes 
to be still nndescribed, woidd thus seem to be allied in the structure of its molars to 
N. falconeri ; and it is interesting to find indications that the African wart-hogs were 
probably connected through an extinct North African form with a highly specialized 
true pig from the Siwaliks of India. 
The complex structure of the molars of Sus falconeri leads on in another 
direction by an easy transition to the still more complex molars of IJippohyus, and it 
is thus,- as will be shown in the sequel, easy to see how a transition may have been 
effected from the simpler forms of bunodont molars to those of the Selenodonts. 
Distribution . — Remains of S. falconeri have hitherto been obtained only from the 
typical Siwalik Hills (unless some undetermined mandibles noticed in the sequel 
belong to this species). This is another instance of the more or less complete 
restriction of the more specialized forms to the eastern side of India : the more 
generalized forms usually characterizing the western side, although sometimes 
ranging to the eastward. 
Species 4 : Sus hysudeicus, Falc. and Cant. 
'Syn. Sus, sp.. Baker and Durand. 
History . — At the conclusion of their memoir on the fossil Siwalik swine Baker 
and Durand^ observed that an imperfect cranium, of winch they gave a figure,® 
indicated a species of Siwalik pig specifically distinct from the one they had first 
described (N. falconeri). They observed that this second species Avas of smaller size 
than the existing S. cristcdus ; and differed also, among other characters, by the more 
simple structure of the talon of ra. 3 . In the “F.A.S.”* a large number of specimens 
of the teeth and jaAA^s of a small Siwalik pig were figured by Falconer and Cautley 
under the name of S. hysudricus] although no description of the species was ever 
published. A comparison of the figm-es shows that the sjDecies so designated is the 
same as the smaller Sus described by Baker and Durand. 
Upper dentition and cranium . — In plate LXX., figs. 2, 2a, of the “ F.A.S.” there 
is represented the middle portion of a cranium of this species from the Siwalik 
Hills, in which m. 3 is not protruded, and the canine is of extremely small size ; the 
latter character indicating that the specimen belonged to a female. A full-sized 
view of the dentition of this specimen is gNen in jolate LXXI., fig. 9, of the same 
work. The pre-orbital concavity is narrow behind, as in S. verrucosus ; and the form 
of the cranium appears to be relatively short and tall, as in the majority of existing 
1 “ Mammiferes Tertiaries,” pp. 73-4. 2 ‘ Journ. As. Soc. Beng.,’ vol. V., p. 668. 
3 Ibid, pi. XLIV., fig. 6. 1 Part VIII., plates LXX., LXXI. (1847). 
L 
