86—52 INDIAN TERTIARY AND POST-TERTIARY VERTEBRATA. 
figured^ under tlie name of Ilippohjus sivalensis, which was probably at that time a 
manuscript name of Falconer and Cautley’s ; and it is stated that the structure of 
the upper molars makes an approach to that of the same teeth in the hippopotamus.^ 
In the 8th part of the “Fauna Antiqua Sivalensis (1847) a skull and three 
fragments of the mandible are figured under the name of Sus ( lUppohjus) sivalensis ; 
while in the notice of the Siwalik fauna in the “ Paleontological Memoirs,”^ 
compiled from Falconer’s notes and letters, Ilippohyus is alluded to as a distinct 
genus. It thus seems doubtful whether this name was intended by its founders to be 
used in a generic or subgeneric sense : the peculiar character of the dentition leads, 
however, to the conclusion that it should be used in the latter sense, although there 
are not wanting signs of a transition from this genus to S us. Beyond the brief 
notice by Sir R. Owen no description of the type species has ever been published. 
The present writer has recorded® the occurrence of the genus in the Siwaliks of the 
Punjab, and indicated the ^possibility of some of these remains belonging to a 
second sjDecies. 
Cranium and upper dentition. — Three views (!■) of the type cranium, which is in 
the British Museum, are given on plate LXX. of the “ F.A.S.,” and the dentition of 
the right side (reversed) is represented of the full size in fig. 1 of the succeeding 
plate. With the exception of the loss of the zygomatic arches, the extremity of the 
premaxillse, and a portion of the occiput, the specimen is in excellent preservation : 
it shows the alveoli of three incisors, of the canine, and of the first and second 
premolars ; the remaining five teeth are in position, but m. 3 is not fully protruded, 
which indicates the sub-adult condition of the specimen. In the following table its 
dimensions are compared with those of a male skull of Bus andamanensisj viz .: — 
From occipital condyle to anterior border of incisive alveolus 
Uippohyus. 
9-0 
Sus. 
8 9 
, , lower border of foramen magnum to posterior border of palate 
2-3 
2-4 
, , posterior border of palate to posterior border of incisive 
foramen 
5-4 
5-16 
Transverse diameter of both condjdes 
1-88 
1-56 
Length of palate .... 
6-3 
6-2 
,, ,, series of cheek-teeth . 
4-3 
3-54 
,, ,, palate in front of pm. 1 
1-9 
2-61 
Width of intermolar space at m. 2 
1-2 
0-88 
,, ,, palate at canines 
105 
10 
»» »> n ^ 
0 7 
0-6 
Length of three true molars 
2-7 
2-2 
Interval between pm. 1 and pm. 2 
0-2 
0-0 
Length of pm. 3 .... 
0-5 
0-4 
Width „ ,, ,, ...■■. 
0-4 
0-33 
Length „ ,, 4 
0-5 
0-44 
Width ,,,,,, 
0-5 
0-45 
Length ,, m. 1 
0-6 
0-57 
Width 
0'6 
0-48 
Length ,, ,, 2 
0-9 
0-7 
Width .... 
0-8 
0-58 
Length „ ,, 3 
1-15 
0-95 
Width ,,,,,, • > • 
0-8 
0-61 
Interval between i. 3 and pm. 3 
0-6 
1-30 
1 Plato CXL., fig. 7. 
2 It is very doubtful wbether the name Uippolnjus was intended to indicate affinity with the hippopotamus, or with the 
horse ; to the molars of the latter of which those of this Siwalik pig present a distant resemblance in the pattern of their 
grinding surface. 
3 Pis. LXX., LXXI. 
4 Vol. I., p. 22. 
5 ‘ Records,’ vol. XI., p. 82. 
