OP CONCHOLOGY. 11 



This small species has much resemblance in outline and 

 surface to My a arenaria. 



The figure is only approximate to the true outline, as the 

 shell is slightly crushed. 



MACTKIDiE. 



SPISDLA, Gray. 



S. capillaria, Conrad. — PI. 3, fig. 10. 



Description. — Triangular, subequilateral; umbo prominent; 

 lunule not defined; surface with prominent or coarse lines of 

 growth ; anterior margin very regularly rounded ; posterior side 

 sub-cuneate, slightly contracted or flattened on the disk; um- 

 bonal slope abrupt, but undefined by an angle, except on the 

 umbo; posterior slope with hair-like, oblique lines; lateral 

 teeth striated with minute, but distinct lines. 



Locality. — James Eiver ? Va. 



TELLLNID^E. 



TELLINA,Lin. 

 Subgenus, ANGULUS, Muhlfeldt. 



T. peracuta, Conrad. — PI. 4, fig. 11. 



Description. — Elliptical, subequilateral; posteriorly rostrated 

 and acute. 



Locality. — Shiloh, Cumberland Co., N. J. 



A small species, allied to T. polita, Say, but longer in pro- 

 portion, and more acute. 



Subgenus, TELLINELLA 1 Gray. 



T. capillifera, Conrad.— PL 4, fig. 2. 



Description. — Triangular, inequilateral, very thin in sub- 

 stance ; umbonal slope of right valve slightly carinated, sub- 

 marginal, straight, bounded posteriorly by a slightly impressed 

 line, end sub-truncated, much above the line of the base ; sur- 

 face with minute, close, hair-like, concentric lines on the ante- 

 rior side ; lateral teeth prominent ; left valve ventricose. 



Locality. — Shiloh, Cumberland Co., N. J. 



The extreme fragility of this shell has prevented me from 

 ascertaining the hinge of the deeper valve, and the species is, 

 therefore, only provisionally referred to Tellinella. 



MYSIA, Leach. 



M. parilis, Conrad. — PI. 4, fig. 1. 



Description. — Equilateral, nearly circular, ventricose, thin 

 and fragile ; basal and anterior margin regularly rounded. 



Locality. — Shiloh, Cumberland Co., N. J. 



