8TJID.E. 253 



18956. The symphysis and right ramus of the mandible of a male, 

 showing all the teeth except the incisors and pm. 2 ; from 

 a cavern in Minas Geraes. 



Claussen Collection. Purchased, 1845. 



18956 a. The nearly complete mandible of a female ; from a 

 cavern in Minas Geraes. 



Claussen Collection. Purchased, 1845. 



18958 f. Fragment of the left ramus of the mandible, containing 

 the unworn m . 3 ; from a cavern in Minas Geraes. 



Claussen Collection. PurcJiased, 1845. 



18958 h. Three specimens of the humerus ; from the caverns of 

 Minas Geraes. Claussen Collection. Purchased, 1845. 



18958 i. Three specimens of the radius and ulna ; from the caverns 

 of Minas Geraes. Claussen Collection. Purchased, 1845. 



18958 j. Three specimens of the two median metacarpals ; from 

 the caverns of Minas Geraes. 



Claussen Collection. Purchased, 1845. 



Genus HYOTHERIUM, H. v. Meyer '. 



Syn. Pal&ochcerus, Pomel 2 . 



Chceromorus, P. Gervais 3 (ex Lartet, MS.). 

 Chcerotheiium, Lartet 4 . 

 Amphichcents, Bravard, MS. 



Dentition : I. ^, G. j-, Pm. ^, M. |. The genus is represented in 

 the Tertiaries of Europe, Asia, and America. It is not regarded by 

 Filhol as the ancestral form either ofSus or Dicotyles ; but it is most 

 probable, from the structure of its molars, that it was intimately 

 related with such ancestral stock. Allied extinct American forms, 

 in one of which the number of premolars is |, have been described 5 . 

 The upper premolars are simpler in structure than the true molars. 



1 ' Die fossilen Zahne und Knochen von Georgensgmiind,' p. 43 (1834). 



2 Bull. Soc. Geol. France, ser. 2, vol. iv. p. 381 (1847 [read 1846]). 



3 Zool. et Pal. Franijaises, 1st ed. vol. i. p. 198, note 1 (1848-52). 

 * Notice sur la Colline de Sansan, p. 32 (1851). 



5 Vide ' Palaeontologia Indica,' ser. 10, vol. iii. p. 94. 



