96 



lete on the anterior margin and rear 3 the hinge on the posterior 

 margin. 



Length one inch. Breadth one inch and one-fifth. Inhabits 

 the coast of the Middle States. Cabinet of the Academy and 

 Philadelphia Museum. 



Very similar in form to the preceding, but it is distinguish- 

 able by the much less elevated and more numerous bands, and by 

 the bifid, unequal and less numerous longitudinal lines. I have 

 only found them on the coast of New Jersey and Maiyland. 



Venus castanea. — Shell thick and ponderous, suborbicular, 

 or subtriangular, with prominent and nearly central beaks ; lunule 

 excavated, lanceolate; cartilage slope rectilinear, indented; valves 

 with minute concentric wrinkles, and larger waves; epidermis 

 chestnut-brown, with darker or paler zones ; within white, the 

 margin very regularly crenulated. 



Length one inch. Breadth one inch nearly. Inhabits the 

 coast of New Jersey. Cabinet of the Academy and Philadelphia 

 Museum. 



A very thick shell, not unfrequent on the coast at Great Egg 

 Harbor. The surface is often sculptured with very slightly elevated, 

 obtuse lines, which are sometimes elevated and acute ; it very 

 closely approximates to Veiius sulcata as figured by Maton and 

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



Cytherea occulta. — Shell suborbicular, or subtriangular, thick, 

 with very numerous approximate, obtuse, transverse and longitu- 

 dinal, elevated lines, which are nearer to each other than the 

 length of their own diameters, the longitudinal ones not being visi- 

 ble to the imassisted eye; lunule destitute of the longitudinal lines ; 

 color yellowish-white with a few large brown spots, luniile and 

 ligament slope transversely 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 Museum. 



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. 



Tellina alternata. — Shell compressed, oblong, narrowed 

 and angulated before, white ; numerous parallel, equal, equidistant, 



