55 Olsson, Neocene Fossils 17 



strosa Gmelin contains shells which have the right valve slightly 

 larger and overlapping on the left. This species probably burrowed 

 in the sand. The Miocene shell compares well with the type 

 form of this subgenus but possesses a much more degenerate hinge. 

 Yorktown formation, James river, 5 miles north of Smith- 

 field; Bellefield. 



Erycina regifica, n. sp., Platen Fig's 3-6 



Shell small, thin, moderately convex, very inequilateral; an- 

 terior end much longer and with the beaks situated near the post- 

 erior end; posterior extremity well-rounded, the anterior more 

 pointed; surface sculptured with obsolete concentric lines, which 

 occasionally are wave-like on the middle of the shell surface, in add- 

 ition a peculiar hair-like, radial sculpture is present and quite pro- 

 nounced over the greater portion of the shell surface, but lacking 

 from the umbones ; umbones smooth and polished ; hinge strong, 

 with a single, small, cardinal tooth and two lateral laminae in 

 each valve ; interior smooth, with the muscular scar well marked 

 and with obscure radial rays. 



Leiigth j. 5, height 5.25, thick?iess 2.5 mm. 



This species is readily distinguished by the peculiar, sharp, 

 hair-like, radial striae. In shape the species recalls E. caroline?i- 

 sis Dall, but is much more inequilateral. Its hinge is well devel- 

 oped, with the cardinal and lateral lamellae rather close together, 

 and in this feature suggestive of Lefiton. 



Duplin Miocene of South Carolina, Peedee river ? 



Bornia virginiana, n. sp., Plate 2, Fig's 4, 8 



Shell oblong, thin, convex, inequilateral ; beak with the pro- 

 dissoconch evident, slightly recurved ; hinge normal, with the 

 lamellae of the right valve slightly shorter ; surface polished, 

 with regular, impressed, concentric lines and with occasionally 

 more distant ones representing resting stages ; a slight, broad fur- 

 row extends from the beak to the basal margin ; anterior and 

 posterior ends with 3 or 5 radial plications which crenulate the 

 basal margin ; basal margin with a flat broad ribbon. 



Height 5 .5 , width 7.5, thickness 2. 75 mm. 



