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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. horealis. 



Pecten dislocatus. — 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 veiy 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. Greatest 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 cuiious 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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