OF THE UNITED STATES. S25 



CREPIDULA. Lam. 

 Species. 



1. C. fornicata ? var. Shell transversely wrinkled, 

 varying in convexity, with obsolete longitudinal, un- 

 dulated, rufous lines ; one side more oblique than 

 the other ; apex excurved, a little prominent, but not 

 separated from the body of the shell, and generally 

 united with the margin of the aperture ; aperture 

 suboval ; diaphragm a little concave, occupying at 

 least half of the length, edge generally reclivate. 



Inhabits the coast of the United States. 



Length 2 inches. 



Cabinet of the Academy and Philadelphia Mu- 

 seum. 



Seems to differ from the species as described by 

 Roissy in Sonni. Buff, by having lateral lineations 

 instead of spots. It may very probably be a distinct 

 species. 



2. C. *depressa. Shell very much depressed, 

 transversely wrinkled, nearly equilateral ; epidernis 

 pale yellowish- brown ; apex not curved, forming a 

 simple acute terminal angle upon the margin of the 

 aperture ; aperture subovate ; within white ; dia- 

 phragm convex, edge contracted in the middle and at 

 one side. 



Length four-fifths of an inch. 

 Inhabits the southern coast of the United States. 

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