258 



vol. xxix. pi. i., being intermediate in point of size 

 between the specimens represented in figs. 6 and 7. 



Pomel Collection. Purchased, 1851. 



Hyotherium simplex (P. Gervais x ). 

 Syn. Chceromorus simplex, P. Gervais 2 . 



As already mentioned, Peters identified this form with H. typum, 

 but the specimen noticed below indicates a much smaller animal. 

 Hob. Prance. 



M. 2204. Part of the right ramus of the mandible containing the 

 last four cheek-teeth ; from the Middle Miocene of Sansan 

 (Gers), Prance. This specimen agrees precisely with the 

 dimensions of the type mandible described by Gervais, 

 and figured by him, op. cit. 2nd ed. pi. xxxiii. fig. 5 3 , as 

 is shown by the following measurements : 



Type. B. M. 

 Length of space occupied by the three 



true molars 0,0385 



Length of nTT 0,011 0,0113 



in72 0,013 0,013 



nT3 0,016 0,0165 



Purchased, 1855. 



M. 2398. Portion of the humerus, radius, and three metapodials, 

 probably belonging to this species; from the Middle 

 Miocene of Sansan. No history. 



Limb-bones of Hyotherium. 



40895. Two metapodials of a large species; from the Lower 

 Miocene of Allier. Presented by C. Falconer, Esq., 1867. 



21968. A metapodial of a very small species; from the Lower 

 Miocene of Allier. Croizet Collection. Purchased, 1848. 



40768. The proximal extremity of a metapodial of a small species 

 ([?] H. simplex) ; from the Middle Miocene of Sansan. 



Presented by C. Fakoner, Esq., 1867. 



1 Zool. et Pal. Fransaises, 1st ed. vol. ii. Exp. no. 33, p. 7 (1848-52), Charo- 

 moria. 2 Loc. cit. 



* In the figure m . l is too long. 



