HIPPOPOTAMID^E. 277 



together with the corresponding tooth of the opposite 

 side, was obtained from the Siwaliksof 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 the present writer in the 

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

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

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

 anterior premolar of Tapirus. 



Made in the Museum, 1885. 



Family HIPPOPOTAMTD^E. 



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 . 

 Choeropsis, Leidy 4 . 



Dentition : I. [-7^5 C. ^, Pm. \, M. |. The reasons for including 

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

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



f^ippopotamtuf ampfjiftiug, Linn. 5 



Syn. Hippopotamus antiquus, Desmarest 6 . 

 Hippopotamus capenxis, Desmoulins 7 . 

 Hippopotamus seneaalensis, Desmoulins *. 

 Hippopotamus major, Owen 9 . 

 Hippopotamus annectans, Falconer 10 . 

 Tetraprotodon amphibitts, Falconer u . 

 Tetraprotodon major, Falconer 12 . 



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



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



a 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 Mammalogie, p. 388 (1822). 



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



9 Hep. Brit. Assoc. for 1843, p. 223. (From Cuvier's Grande Hippopotawe 

 Fossile, Ann. d. Museum, vol. v. p. 106 [1804]). 



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



II Ibid. p. 236. 12 Ibid. p. 237. 



