NUCULA L^VIS. 



SPECIFIC CHARACTER. 



Transversely elongate-subovate, rostrated, nearly smooth. 



SYNONYM, 



NucuLA LiEYis. NoMs, Jouv. Jlcud. Nat. Sc. vol. iv. 

 p. 141. 



DESCRIPTION. 



Shell compressed, thin, fragile, polished, smooth, slight- 

 ly vrrinkled tow-ards the base : beaks nearly central, a little 

 prominent beyond the hinge margin, rounded, approxi- 

 mate : series of teeth subrectilinear, a little arquated be- 

 hind ; teeth prominent : hinge margin exteriorly both be- 

 fore and behind the beaks rather abruptly compressed, 

 the anterior compression extending from the beaks to the 

 tip : posterior margin rounded : anterior margin somewhat 

 rostrated, the anterior hinge margin rectilinear, very little 

 reflected at tip : inner inargin simple. 



Length nearly half an inch, breadth nearly one inch. 



This shell may be compared Mith the 'N.pellucida, Gniel. 

 but it is shorter in proportion to its width, and the beaks 

 are nearer the centre. The beaks are more prominent than 

 in limatula, and the base is more arquated. It is a fossil 

 species and was found by Mr. John Finch in Maryland. 



REFERENCE TO THE PLATE. 



The right figures represent the outer and inner view of the Bhell. 

 PLATE XII. 



