PL EIOCENE FOSSILS. 81 



Description. Shell large, ovate, moderately thick and convex; beaks prominent; 

 dorsal margin depressed, slightly arcuated ; anal margin obtusely rounded ; lunule large 

 lanceolate. 



Plate XXI. Fig. 4, Natural size. 



Locality. Pee Dee. 



Museum, College of Charleston. 



VENUS ME EC EN ARIA. — Linn. 

 Plate XXI. Fig. 6. 



Venus mercenaria, Linn., Syst. Nat., 1131. 



Venus mercenaria, Gmelin, Syst., 3231. 



Venus mercenaria, Lam., An. sans. Vert,, Vol. 6, p. 346, pi. 263. 



V. testa solida, obliqita cordata, concentrice sulcata, radiatim striata; latere anali sub- 

 elongato; latere buccali brevi; umbonibus incurvis; lunula cordata. 



Description. Shell solid, obliquely cordate, concentrically furrowed, radiately striate; 

 anal side somewhat produced, angled; buccal side short; umbones recurved; lunule 

 cordate. 



The anal slope is comparatively straight, and where it joins the pallial margin it is 

 slightly produced into a flattened lip. 



This species attains a considerable size, and then resembles V. permagna, but the buccal 

 side in the latter is a portion of a curve of shorter radius, and the whole shell is covered 

 with raised lines of growth. 



This common shell of our entire coast is very rare in the Tertiary beds of the State, 

 where a few separate valves only have been found. 



Plate XXI. Fig. 6. 



Locality. Darlington District, 



Museum, College of Charleston. 



