84 PLE IOC EN E FOSSILS. 



Description. Shell sub-trigonal, slightly ventricose; ribs about 25, concentric, lamelli- 

 form, elevated, recurved, with elevated transverse striae on the inferior side of each; lunule 

 cordate laminated; inner margin crenulated. 



This species occurs recent on the coast of South-Carolina, and is often found in the 

 Post Pleiocene beds of this State. 



Plate XXI. Fig. 10, Interior of right, and exterior of left valve, natural size. 



Locality. Waccamaw. Darlington. 



Museum, College of Charleston. 



VENUS CANCELLATA. — Linn. 

 Plate XXI. Fig. 11. 



Venus cancellata, Linn., Sys. Nat., Ed. 12, p. 11-30. 



V. testa crassa, sub-depressa, decussata, radiatim striata, concentrice sulcata; sulcis remotis, 

 inmqualibus, elevatis; latere anali larnelloso; dentibus cardinalibus crassis, lunula cordata, 

 margine crenulata. 



Description. Shell thick, somewhat compressed, decussated, radiately striate, concen- 

 trically sulcate; furrows remote, unequal, elevated; anal side lamellar; cardinal teeth 

 thick ; lunula cordate ; margin crenulated. 



This common shell of our coast is readily distinguished by the raised, concentric and 

 remote lines of growth. The radiating strise are alternately larger and smaller. On the 

 anal margin, the elevated lines of growth become somewhat squamose. The pallial sinus 

 is very short; lunule broadly cordate. This shell cannot be confounded with V. elevata, 

 which is more inflated and has the lines of growth more regularly disposed and more 

 approximating. 



Plate XXI. Fig. 11. 



Locality. Sumter District. 



Museum, College of Charleston. 



