HIPPOPOTAMIDJE. 277 



together with the corresponding tooth of the opposite 

 side, was obtained from the Siwaliks of Khushalghar, below 

 Attock, Punjab, and is preserved in the Indian Museum, 

 Calcutta. They both belong to the same individual as the 

 type true molars figured by. f the present writer in the 

 1 Palaeontologia Indica,' ser. 10, vol. iii. pi. viii. figs. 15 a, 

 17 ; and are noticed in ' Falconer's Palaeontological Me- 

 moirs,' vol. i. p. 415, where they are compared to the 

 anterior premolar of Tapirus. 



Made in the Museum. 1885. 



Family HIPPOPOTAMUS. 



In the form of the mandible, which has a descending plate at the 

 angle, this family closely resembles Merycopotamus. The molars 

 are bunodont in structure, with four columns, which present trefoil- 

 shaped disks on their worn surfaces. 



Genus HIPPOPOTAMUS, Linn. 1 



Including : — Hexaprotodon, Falconer and Cautley 2 . 

 Tetraprotodon, Falconer and Cautley 3 . 

 Chceropsis, Leidy 4 . 



Dentition : — I. [x=l)» C- \, Pm. |, M. |. The reasons for including 

 all the forms in the type genus are given by the present writer in 

 the ' Palseontologia Indica,' ser. 10, vol. iii. p. 47. 



hippopotamus ampfjtutus, Linn. 5 



Syn. Hippopotamus antiquns, Desmarest 6 . 

 Hippopotamus capensis, Desmoulins 7 . 

 Hippopotamus senegalensis, Desmoulins 8 . 

 Hippopotamus major, Owen 9 . 

 Hippopotamus annectans, Falconer 10 . 

 Tetraprotodon amphibius, Falconer n . 

 Tetraprotodon major, Falconer 12 . 



There are two incisors in each jaw ; the inner lower incisor is 



1 Syst. Nat. ed. 12, vol. i. p. 101 (1766). 



2 Asiatic Researches, vol. xix. p. 51 (1836). 3 Loc. cit. 

 4 Journ. Ac. Nat. Sci. Philad. ser. 2, vol. ii. p. 213 (1853). 5 Loc. cit. 



6 Mainmalogie, p. 388 (1822). 



7 Journ. de Physiol, vol. v. (1825) {teste Morton). 8 Loc. cit. 



9 Rep. Brit. Assoc, for 1843, p. 223. (From Cuvier's Grande Hippopotame 

 Fossile, Ann. d. Museum, vol. v. p. 106 [1801]). 



10 Journ. Ac. Nat. Sci. Philad. ser. 2, vol. i. p. 237 (1849). 



11 Ibid. p. 236. ,2 Ibid. p. 237. 



