236 



The specimen is completely fossilized, and was discovered, with the re- 

 mains of the Mylodon, Megatherium, and other extinct animals, in the 

 tertiary deposits at Punta Alta, Bahia Blanca, South America, by the 



Donor, Charles Darwin, Esq., F.R.S. 



1031. A middle molar, left side, upper jaw, of the same species of Horse (Equus 

 curvidens). 



This tooth was discovered in the red argillaceous earth of the Pampas 

 at Bajada de Santa Fe, in the province of Entre Rios, South America. 

 It agrees so closely in colour and condition with the remains of the 

 Mastodon and Toxodon from the same locality, as to leave no room for 

 doubt respecting the contemporaneous existence of the individual Horse 

 to which it belonged. Presented by Charles Darwin, Esq., F.R.S. 



Genus Hippopotamus. 



1032. The tip of the left external inferior incisive tusk of a fossil Hippopo- 



tamus. It was found associated with the molars of a large Ox or 

 Aurochs. 



Locality unrecorded. Hunterian. 



1033. The extremity of the right upper canine of the Hippopotamus major, 

 Cuvier ; it is imbedded in a mass of breccia. 



Locality unrecorded. Hunterian. 



1034. The external wall of the right inferior canine or tusk of a young indivi- 



dual of the Hippopotamus major, Cuvier. 



Locality unrecorded. Hunterian. 



1035. The internal wall of apparently the same tusk. 



Locality unrecorded. Hunterian. 



1036. A much-worn crown of an upper molar of the Hippopotamus major, Cuv. 



Locality unrecorded. Hunterian. 



1037- The anterior part of a lower molar of the Hippopotamus major, Cuvier. 

 Locality unrecorded. Hunterian. 



