52 PLEIOCENE FOSSILS. 



N U C U L I D M . 



NUCULA. — Lam. 



NUCULA LIMATULA. — Say. 



Plate XVII. Figs. 13 to 15. 



Nucula limatula, Say, Amer. Conch, pi. 12. 



Nucula limatula, Say, Foss. Ter. For., p. 57, pi. 30, fig. 4. 



Nucula limatula, Say, Conrad's Am. Marine Conch., p. 30, pi. 6, fig. 1. 



N. testa elongata, compressa, laevigata, polita, incequilateralis; latere buccali rotundato; 

 latere anali angusto, sub-recurvo; lunula lineata. 



Description. Shell elongated, compressed, smooth, polished, inequilateral; buccal side 

 rounded; anal side narrow, somewhat recurved; lunule linear. 



In the Tertiary of South-Carolina there are no forms of this genus with which this 

 species can be confounded. Its smooth surface, elongated form, and regularly carinated 

 pallial margin, are sufficiently characteristic. Occasionally a few obsolete concentric lines 

 may be seen on the disks, and one or two on the anal margin, towards its extremity. 



It occurs fossil both in Virginia and North-Carolina. Although found living in con- 

 siderable numbers on the coast of South-Carolina, it is quite rare in the Tertiary of the 

 State. 



Plate XVII. Fig. 13, Exterior of right valve. 

 " 14, Interior of left valve. 

 " 15, Magnified hinge and teeth. 



Locality. Sumter District. 



Museum, College of Charleston. 



