ANIHEACOTHEEHD^E. CH(EROPOTAMID^. 247 



Anthracotherium, sp. d. 

 Hob. England. 



29856. The right ramus of a mandible, containing m . 2 and mT3, 

 apparently belonging to the present genus ; from the 

 Headon beds (Upper Eocene) of Hordwell, Hampshire. 

 The molars are larger, and the jaw is deeper than in 

 A. gresslyi, but the structure of the teeth is very similar. 

 The length of ^T3 is 0,014, and the depth of the jaw 

 behiiid that tooth 0,026. 



Hastings Collection. Purchased, 1885. 



Family CHCEROPOTAMID^. 



The true molars are intermediate in structure between those of 

 Anthracotherium and the more generalized Suidce like Hyoiherium. 

 Those of the upper jaw have five columns, arranged as in the 

 Antliracoiherudce. Chceropotamus steinheimensis, Fraas (vide Jahresh. 

 Yer. Nat. Wiirtt. 1885, pi. v.), seems to belong to Hyoiherium. 

 Cebochcerus is noticed in the Addenda. 



Genus CHCEROPOTAMUS, Cuvier 1 . 

 Dentition : I. |, C. \, Pm. |. M. |. There is a third lobe to uTTS. 



O 5 1' O' O 



Chceropotamus gypsorum, Desmarest 2 . 



Syn. Chceropotamtts cuvieri, Owen 3 . 



Chceropotamus parisiensis, Blainville 4 . 

 Chceropotamus affinis, P. Gervais 5 . 



The upper true molars resemble those of Anthracotherium silis- 

 trense, but have shorter crowns, with a less approach to a selenodont 

 structure. 



Hub. Europe. 



30667. Part of the right maxilla, showing the last four cheek- 

 teeth in a worn and somewhat broken condition; from 



1 Ossemens Fossiles, 2nd ed. vol. iii. p. 260 (1822), Choeropotame. 



2 Mammalogie, p. 645 (1822). 



3 Trans. Geol. Soc. ser. 2, yol. vi. p. 41 (1841 [read 1838]). 



4 ' Osteographie,' Genus Chceropotamus, pi. i. (1846). 



5 Zool. et Pal. Frangaises, 1st ed. vol. i. p. 95 (1848-52). 



