228 RODENTIA. 



first molars; from the caves of the Wellington Valley, 



Australia. 



Presented by the Trustees of the Australian Museum, 1867. 



Genus CRICETODON, Lartet l , 



The molars are not unlike those of Cricetus, but there are only 

 two pairs of tubercles on the first tooth in each jaw. The molars 

 are also very like those of Hesperomys ; and it is not improbable that 

 the fossil genus may have been the ancestral form of several of the 

 allied existing genera. 



Cricetodon minor, Lartet 2 . 

 Syn. Cricetodon pygmceus, Fraas 3 . 



This is a very minute species. 

 Hab. Europe. 



33270. Numerous molars ; from the Middle Miocene of Sansan 

 (Gers), France. As these teeth, as well as the specimens 

 of the other two named species from the same locality, 

 were determined by Lartet, the correctness of the specific 

 reference may be assumed. Presented by M. Ed. Lartet. 



Cricetodon medius, Lartet '. 

 Syn. Cricetodon minor, Fraas 5 (teste Schlosser). 



This species is rather smaller than Mus rattus, the length of the 

 space occupied by the cheek-teeth being about 0,006. 

 Hab. Europe. 



33269. Detached teeth and fragments of the maxilla and mandible ; 

 from the Middle Miocene of Sansan (Gers), France. 



Presented by M. Ed. Lartet. 



Cricetodon cadurcensis, Schlosser . 

 Hab. France. 



M. 1632. A ramus of the mandible ; from the Upper Eocene of 

 Caylux (Tarn-et-Garonne), France. This specimen agrees 

 precisely with the one figured by Schlosser, loc. cit. pi. viii. 

 figs. 22, 28. The length of the space occupied by the 



Notice sur la Colline de Sansan, p. 20 (1851). 2 Loc. cit. 



Fauna von Steinheim, p. 14 (1870). 



Notice sur la Colline de Sansan, p. 20 (1851). 



Fauna von Steinheim, p. 13 (1870). 



Palaeontographica, vol. xxxi. p. 90 (1884). 



