SIWALIK AND NARBADA BUNODONT SUINA. 
9—43 
small interval between the canines, undoubtedly indicates a nearer approximation to 
the pigs than is exhibited by any other species of the genus, in which the complete 
symphysis is known. The mandible indicates a species about one-third smaller than 
H. sivalensis. 
Limb-bones. — In plate LXXXIII., figs. 12, 12a, 12b, of the “ F.A.S.” there is 
represented the distal extremity of the radius of a small hippopotamus from Burma, 
which is referred to II. iravaticus. Its dimensions are compared below with those of 
the corresponding bone of TI. sivalensis,^ viz . : — 
II. iravaticus. H. sivalensis. 
Transverse diameter of articulating surface . . . 2'8 4'0 
Ant. -post. ,, ,, ,, ... 1-7 2T5 
A similar specimen in the Indian Museum is catalogued by F alconer,^ and there 
is also the lower end of a femur in the same collection. The distal articular surface 
of the radius of II. iravaticus is less expanded laterally than in H. sivalensis ; and 
thereby exhibits more affinity to the pigs. There are one or two other bones in the 
British Museum, which may not improbably be referred to the present species. 
Distribution. — With the exception of a few bones in the Indian Museum from 
the Siwaliks of Burma, the above-mentioned remains are all that can be referred to 
the jiresent species, which has hitherto been certainly determined only from Burma. 
Species 3 : Hippopotamus namadicus, Falc. and Cant. 
Syn. Ilexaprotodon namadicus, F. and C. 
Distorijd — In jilate LVII., figs. 12, 1 2a, and in plate LVIII., figs. 1, la, 2, 2a, 
3, 3a, of the “ F.A.S.” there are figured four specimens of the mandible of a 
hexaprotodont hippo 2 iotamus from the Narbadas, under the name of II. namadicus. 
The species was, however, never described; but Falconer^ mentioned that it was 
larger than H. ampliibius, or D. sivalensis, and had well-marked specific characters. 
The jiresent writer^ has suggested that this sjiecies might possibly be the same as 
a. palceindicus, but later observations disprove this view. 
Mandible. — The mandibles figured in the “ F.A.S.” show a considerable variation 
in size, the largest (pi. LVIII., fig. 1) exceeding the largest mandible of H. sivalensis. 
The incisors are three in number on either side ; the second being smaller than 
either of the others, and its alveolus placed slightly above the level of those of the 
other two : this character is more marked in some specimens than in others, and is 
especially noticeable in a mandible from the Narbadas in the Indian Museum 
(No. F. 147). These mandibles are readily distinguished from the mandible of 
1 “ F.A.S.,” pi. LXV., fig. 18. 
2 Vi^e ” Pal. Mem.,” vol. 1., p. 142. In this passage the specimen is compared to the radius of H. sivalensis figured in 
pi. LXV., fig. 18, of the ‘‘ F.A.S.” The numbers were, however, left blank in Falconer’s Catalogue, and were evidently 
filled up by the editor of the “ Pal. Mem ”: they should have been pi. LXXXIII., fig. 12. 
3 Xumerous remains of hippopotami from the Narbadas were described by Dr. Spilsbury in the ‘ Journ. As. Soc. Beng.’ : 
but these descriptions need not be quoted on this occasion. 
4 “ Pal. Mem.,” vol. II., p. 40G. 
5 ‘ Ilecords,’ vol. XV., pp. 102-3 
