96 
iete on tlie anterior margin and rear ; 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 Maryland. 
Venus castanea. — Shell thick and ponderous, suborbicular, 
or sub triangular, 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 Venus sulcata as figured by Maton and 
Rackett, Trans. Lin. Soc. Lond. vol. 8, pi. 2. 
C ytherea 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 unassisted eye ; lunule destitute of the longitudinal lines ; 
color yellowish-white with a few large brown spots, lunule 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, 
