fart 2.] Lydekker: New or rave Mammals from the Siwaliks. 
77 
of a small suine animal, which cannot be referred to any European fossil genus, and 
which from their size I have no doubt belong to the present species. The masticating surface 
of one of these teeth is raised into four cones, separated by a cruciform valley, of which 
the antero-posterior division is very shallow; there is an accessory cone behind the two 
anterior cones; the whole crown is surrounded by a crenulated cingulum ; the dimensions of 
one of the specimens are as follows:— 
Inch. 
Length ... ... .. .. .. ... -55 
Breadth .. .. .. .. ... ... ... - 52 
Height of crown .. . r .. *29 
The excess in size of this tooth over the lower molar of Sanitherium Schlagintweitii 
is proportionate to the excess in size of the upper over the lower molars of the pig. The 
upper molars seem to be nearest to those of Chcerotherium, but are distinguished by the 
greater proportionate length of their antero-posterior diameter, and by the larger size of 
the fifth tubercle on the masticating surface. 
Chceromeryx silistrensis, Pentland, sp. 
This genus has been hitherto known only by three specimens of upper molars from 
Caribari (Garo hills, N. E. Bengal)* which were originally figured by Pentland in the second 
volume of the second series of the “ Transactions of the Geological Society of London,” 
under the name of Anthracotherium sitistrense; the genus Ghwromeryx was subsequently 
made by M. Pomelf for the reception of these specimens: the original specimens are now in 
the Museum of the Geological Society. Figures of these specimens are also given on PI. 68 
of the “Fauna AntiquaSivalensis.’’ Mr. Blanford has sent down a single right upper molar 
tooth of this species, which exactly corresponds with the larger of the original specimens, 
and which therefore requires no further description here. This rare tooth is extremely 
valuable as shewing that the Bengal rocks are on the same horizon as the typical Siwaliks 
of Sind. It is very remarkable that the only known teeth of this genus have been found 
in two localities so far removed from each other as Sind and N.-E. Bengal. 
Hyopotamus PAE1EINDICUS, n. sp. nobis. 
Up to the present time the last noticed genus has been the only one of the pig-like 
animals with five-columned teeth which has been found in India; the exclusively Indian 
genus Merycopotamus differing from its European congeners by having only four columns 
on its upper molars. Among Mr. Blanford’s collection there are two upper molar teeth, 
one much worn, and the other only touched by wear, which belong to a species of Seleno- 
dont pig-like animal, but which carry five columns on the crown, in place of the four of 
Merycopotamus; the additional column occurs between the outer and inner columns of the 
anterior half of the tooth, occupying the same position as in the genus Hyopotamus. 
The general form of the tooth is very like that of Hyopotamus velaunus; the outer 
surfaces of the outer pair of columns of the Indian specimens have, however, a larger 
median ridge, and in this respect resemble Merycopotamus. The form of the worn dentine 
surfaces is like Hyopotamus. From the presence of five columns on the crown of the Sind 
specimens, I have referred the specimens, at all events provisionally, to the genus Hyopota¬ 
mus, with the specific name of palreindicus; further discoveries may shew that the 
specimens belong to a new genus intermediate between Hyopotamus uni Merycopotamus: 
in any case, the specimens are of great interest, in shewing that the two last mentioned 
* The locality is given by Oolebrooke (Tr. G. Soc., Lon., Ser. Il.Vol. I,p. 132)—the left bank of the Brahmaputra, 
above Mohendroganj. The river has moved westward since then, 
t Compt. Rendus, 1848, p, 687. 
