228 RODENTIA. 
first molars; from the caves of the Wellington Valley, 
Australia. 
Presented by the Trustees of the Australian Museum, 1867. 
Genus CRICETODON, Lartet'. 
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’. 
Syn. Cricetodon pygmeus, Fraas*. 
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. Hd. Lartet. 
Cricetodon medius, Lartet ’*. 
Syn. Cricetodon minor, Fraas * (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, Joc. cat. pl. viil. 
figs. 22, 28. The length of the space occupied by the 
1 Notice sur la Colline de Sansan, p. 20 (1851). 2 Loe, cit. 
5 Fauna von Steinheim, p. 14 (1870). 
* Notice sur la Colline de Sansan, p. 20 (1851). 
5 Fauna von Steinheim, p. 13 (1870). 
* Paleontographica, vol, xxxi. p. 90 (1884). 

