274 MARINE SHELLS 



A very thick shell, not unfrequent on the coast at 

 Great Egg Harbour. The surface is often sculptured 

 with very slightly elevated, obtuse lines, which are 

 sometimes elevated and acute ; it very closely ap- 

 proximates to Venus sulcata as figured by Maton and 

 Hackett, Trans. Lin. Soc. Lond. vol. 8. pi. 2. 



CYTHEREA, Lam. 



C. ^occulta. Shell suit orbicular, or subtriangular, 

 thick, with very numerous approximate, obtuse, 

 transverse and longitudinal, elevated lines, which 

 are nearer to each other than the length of their 

 own diameters, the longitudinal ones not being visible 

 to the unassisted eye ; lunule destitute of the longi- 

 tudinal lines ; colour yellowish- white with a few 

 large brown spots, lunule and ligament slope trans- 

 versely spotted with reddish-brown ; margin within 

 entire ; anterior cardinal tooth simple. 



Length and breadth half an inch. 



Inhabits the southern shores. 



Cabinet of the Academy and Philadelphia Mu- 

 seum. 



This shell is very rare, and is not to be mistaken 

 for any other shell which I have seen on our coast. 

 The aid of a magnifier is necessary to discover the 

 longitudinal lines. 



