169— 28. INDIAN TERTIARY AND POST-TERTIARY YERTEBRATA. 
blocked, instead of freely open, on the inner side, and by the inner columns being 
flatter and less completely conical ; this flatness is especially noticeable on the inner 
side. The specimen more nearly resembles the lower molar referred to Hyopotamus 
palceindicus (pi. XXIII, figure 3 ; this figure is viewed more from the external aspect than 
figure 1), but is distinguished by the columns being much narrower and sharper, and 
the median valley narrower and deeper : there is also a more distinct 1 cingulum ’ on 
the anterior aspect. The dimensions of the specimen are as follows : — 
In. 
Length (of two columns) . . . 0'9 
Width 0-6 
Hight of antero-internal column 0-5 
Distribution. — No other remains have hitherto been discovered which can be 
referred to this species, which is thus confined to Sind. It is much to be hoped that 
other remains may eventually be discovered, which will further elucidate the 
affinities of this and the following interesting forms. 
Genus IY : SIYAMERYX, 1 n. gen. nobis. 
Species : Sivameryx sindiensis. nobis. 
Upper molar. — In figure 11 of plate XXIII there is represented, from the 
masticating surface, the single upper molar on which this genus is founded, the only 
previous notice of which will be found on page 80 of the Xlth volume of the 
“Records,” where the name was proposed. The tooth is an almost unworn specimen 
from the right maxilla, and was obtained by Mr. F. Fedden from the lower 
Manchhars of Sind : it is quite perfect. An inspection of the figure will show that 
the tooth clearly belongs to the present group of animals, viz. — tetracuspidate 
selenodont pigs. There is, however, in the structure of the tooth an approach to 
the molars of the pentecuspidate group which lias not been observed in any other 
genus ; it also makes a further step in the direction of the more generalised forms of 
the true ruminants, than the molar of Hemimeryx , but still preserves the open valleys, 
and the complete union of the bases of the outer columns, characteristic of the 
selenodont pigs. On the anterior side of the specimen ( right side of figure ) the ridge 
leading from the inner column carries, near the transverse valley, a small triangular 
process ( not very clearly shown in the figure'), touched by wear before the inner column, 
and evidently the representative of the fifth column of the A n thraco theridm . The 
two inner columns are more developed on the side of the middle valley than in the 
allied genera : there is a well-marked crenulated 1 cingulum ’ on three sides. Without 
further describing the tooth in detail, it will suffice to point out in what respects, in 
addition to the presence of the rudimentary fifth column, it differs from the molars 
of the allied genera. The tooth, except in the absence of the fifth column, presents 
some resemblance to the molars of Hyopotamus crispus , 2 and may have belonged to 
1 Erom Siva (or properly Shiva) the Hindu deity whose name forms the root of the'word Siwaliks (Sivaliks), and merux. 
2 Gervais, “Zoologie et. Paleontologie Francises,” 2nd ed., pis. XXII., fig. 7 : XXXII., fig. 9. 
