NO. 7 NEW SPECIES OP TTIPPOPOTAMUS — MILLER 3 



molar. 53.4x45.4 (51.0x50.8) ; first lower molar, 46.2x31.0 (51.4 

 X33.8); second lower molar, 59.0 x 35.4 (57.0x38.6); width of 

 palate at anterior lobe of m', 68.2 (76.2). 



Remarks.— At present there appear to be three well-marked species 

 of Hippopotamus recognizable among the living members of the 

 genus: (a) True Hippopotamus amphibins^ of eastern and north- 

 eastern Africa, (b) H. constrictus of Angola, and (c) H. aiistralis* 

 Duvernoy of the Cape region. The last I have not seen, but, so far 

 as can be judged from the descriptions of Desmoulins and Duver- 

 noy. it is a form in which the flattening of the cranium is carried 

 even further than in H. constrictus, the orifice of the orbit is wider 

 than high, and there are certain important peculiarities in the inter- 

 relations of the upper and lower canines, and in the form of the 

 anterior cheek-teeth. 



Synonymy : 



1758. Hippopotamus ampJiibius Linnaeus, Syst. Nat., I, loth ed., p. 74 



(Nile). 

 1846. Hippopotamus typus Duvernoy, I'lnstitut, XIV, p. 2>i3- October 

 7, 1846 ("Senegal or Abyssinia"). 

 Synonymy : 



1846. Hippopotamus australis Duvernoy, I'lnstitut, XIV, p. ^;^^. Octo- 

 ber 7, 1846. (Previously described but not named by Desmou- 

 lins, Journ. Physiol. Exp. et Path., V, p. 354, October, 1825.') 



