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which decline from the beaks in both valves, are similarly colored, 
and varied with transverse white marks ; the opposite valve is yel- 
lowish-white, with the usual bands. It must, however, be observ- 
ed, that the epidermis of both these specimens was removed by 
muriatic acid. It is probable that the examination of numerous 
specimens, will prove this to be a distinct species ; if so, it may be 
distinguished by the name of P. borealis. 
Pecten dislocates. — Shell suborbicular, with twenty or 
twenty-two elevated rounded ribs, and very numerous concentric 
wrinkles ; longitudinal striae none ; whitish, tinged with yellow or 
reddish, with a few narrow, transverse, interrupted and dislocated 
sanguineous, undulated lines, and five or six pale-reddish, almost 
obsolete spots on the margin, at the base of the auricles subequal ; 
hinge margin rectilinear in each valve. 
Length one inch and a half. Breadth one inch and three-fifths. 
My Cabinet. 
This is a very pretty species, and seems to be confined to the 
southern coast, where it is rare. It is very different in its colored 
markings from the preceding species, which, however, it much re- 
sembles in form. I have a young specimen, on which the red 
lines are numerous, but are dilated, pale, and tinted with dull 
purplish. 
Pandora trilineata.— Shell white, subpellucid, concen- 
trically wrinkled ; hinge placed at the posterior slope, which is 
very abrupt, and forming a very considerably obtuse angle with 
the hinge margin ; hinge margin concavely much arquated, the 
surface flattened, and bounded on its edges by two elevated ap- 
proximate lines, originating at the beak and continued to the tip, 
which is rostrated ; rostrum ascending ] a distinct, slightly impress- 
ed line originates at the beaks, and passes to the middle of the 
basal margin ; right valve a little convex ; left valve flat. 
Length nine-twentieths of an inch. Glreatest breadth nineteen- 
twentieths of an inch. Inhabits the American coast. Cabinet of 
the Academy and Philadelphia Museum. 
I first discovered a single valve of this curious shell several 
years ago at Great Egg Harbor, on the shores of New Jersey; 
since which I have found two or three others on the coast of 
Georgia and East Florida, so that it may be said to inhabit our 
whole southern and middle coast. The inner edge of the hinge 
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