102 PLEIOCENE FOSSILS. 



Description. Shell sword-shaped; dorsal and pallial margins parallel; buccal and 

 anal margins sub-truncate. 



This is a well-known shell, living all along the coast of the United States. 



Plate XXIV. Fig. 3, Natural size. 



Locality. Pee Dee; Smith's, Goose Creek. 



Museum, College of Charleston, 



The genus Solen commenced its existence during the Cretaceous period. 



PHOLAS.— Linn. 



The genus Pholas commenced its existence in the seas of the Cretaceous period. 



FHOLAS COSTA T A . — L-hus. 5= OA. &U. **£&- CWtA - 



Plate XXIV. Fig. 4. 



Pholas costata, Linn, Syst. Nat., 1111. 



Pholas costata, Lister, Conch., pi. 434. 



Pholas costata, Gualt, Test. t. 105, f. G. 



Pholas costata, Chemn., Conch. VIII. t. 101, f. 863. 



Pholas costata, Brug., Ency. Meth., pi. 169, figs. 1 and 2. 



Pholas costata, Sow., Genera No. 23, pi. 1. 



Pholas costata, Lam., An. sans. Vert., VI., 45. 



Pholas costata, Wood, Gen. Conch., pi. 15, figs. 1 and 2. 



Pholas costata, Gould, Invert, of Mass., p. 26. 



P. testa magna, tenui, oblong o-ovata; margine buccali rotundata; margine anali acutiori; 

 margine dorsali supra umbones reflexa; costis radiantibus regulariter dentatis. 



Description. Shell large, thin, oblong-ovate; buccal margin rounded, anal margin 

 more pointed; dorsal margin reflected over the umbones; ribs radiating, with coarse lines 

 of growth, producing tooth-like elevations at regular intervals on each rib. 



