102 CONCHOLOGIA CESTRICA: 
Shell, solid, trigonal, very oblique; anterior side 
narrower, produced; posterior broad, subtruncate; beaks 
small, elevated, distant, with a wing-like appendage at 
summit; regular-striate ; yellow, gray, chestnut, mixed; 
valves, light blue inside; hinge thick; cardinal teeth 
small, strong, compressed ; lateral teeth short, strong, 
oblique. H. 3%, W. 4, T. 2, mill. 
Station, in company with P. variabile. Pickering 
Creek, Chester County ; not common. 
P. virginicum, GMELIN. 
Tellina virginica, Gmelin, Syst. Nat., 1788. 
BP. virginicum. — [Prime.] 

Shell, thick, solid, oblique, anterior side longer, nar- 
rower, rounded; posterior broader, subtruncate; base 
rounded; beaks posterior, large, prominent; interior 
light blue; epidermis greenish-brown; zoned; hinge 
margin greatly curved; cardinal teeth strong; laterals 
strong, and short) “H’7, W. 0, ¥.'5, mill: 
Station, White Clay and Pickering Creeks, Chester 
County ; abundant. 
P. variabile, Prime, Bost. Proc., IV., 1851. 
P. variabile, — [Prime.] 
Fig. 206, 

