54 PLEIOCENE FOSSILS. 



Description. Shell somewhat lanceolate, inequilateral, concentrically striate; buccal 

 side short, rounded, inflated; anal side produced, beaked, somewhat recurved; lunule 

 lanceolate. 



This little species, which is also an inhabitant of our coast, occurs in the Meiocene of 

 Virginia. It is easily distinguished by its rostrated anal side and regularly striated 

 surface. 



Plate XVII. Fig. 10, Exterior of right valve. 

 " 11, Interior of left valve. 

 " 12, Magnified view of hinge and teeth. 



Locality. Darlington District. 



Museum, College of Charleston. 



The genus Nucula occurs in the Silurian rocks, and has continued an inhabitant of 

 every sea up to the present time. 



LUCWIM. 



LUCINA.— Bruguiere. 



LUCINA CONTRACTA. — Say. 



Plate XVIII. Fig. 1. 



Lucina contracta, Say, Jour. Ac. Nat. Sci., Vol. 4, p. 145, pi. 10, fig. 8. 

 Lucina contracta, Say, Foss. Ter. For., p. 40, pi. 20, fig. 5. 



L. testa orbiculata, inflata, concentrice inaiqualiter costata; interstitiis striatis; latere 

 anali subfilexuoso-excavato; latere buccali subangulato; lunula lanceolata. 



Description. Shell orbicular, inflated concentrically and unequally ribbed; interstices 

 striated; anal margin somewhat flexuosely channeled; buccal margin somewhat angular 

 above; lunule lanceolate. 



