FOSSIL. 



(TERTIARY.) 

 America. 



43. CYRENA CALIFORNICA, Gutch. 

 Ryker's Pass, lat. 38. California. Pleiocene. (Exauctore.) 



Europe. 



(BASIN OF PARIS.) 



a. Cyrena proper. 



44. CYRENA CHARPENTIERII, Deshayes. 



Poti^z et Michaud, Gallerie de Douai. 



a. Epernay. (Ex auctore.) 



b. Ermenonville. (Ex auctore.) 



45. CYRENA COMPRESSA, Deshayes. 



Lamarck, An. VI. 

 Mouy . (Ex auctore . ) 



