FOSSIL CAV1A, MLS, &C. 



of fresh and salt water organic productions in these for* 

 mations, we may suppose that both these fluids must have 

 contributed each their part in their formation. Accord- 

 ing to Cuvier, and Brongniart, who assisted him in exa- 

 mining these formations we have just enumerated, there 

 appears to have been an alternate flux and reflux of salt 

 and freshwater over the country around Paris, and from 

 which these rocks were deposited. This opinion, how- 

 ever, is liable to numerous objections. 



Fossil Organic Remains described by CUVIER, arranged in a 

 Systematic Order* 



CLASS. MAMMALIA. 



ORDER DIGITATA. 



FAMILY. GLIRES. 



Cavia. 



In the quarries of slaty limestone of Aeningen there oc- 

 cur remains of a species of this genus which Cuvier con- 

 jectures to belong to the cavia porcellus or Guinea pig, 

 or more likely to an unknown species either of this tribe 

 or of that entitled arvicola. 



Mus. 



In the slaty limestone rocks at Walsch, in the circle of 

 Saatz in Bohemia, there are fossil remains of a species of 

 this tribe very nearly allied to the mus terrestriB. 



