NATURAL SCIENCES OP PHILADELPHIA. 143 



Neverita duplicata, Say. 



Abundant. 

 Cypraea exanthema, Linn. 



Rare; one specimen (Xo. 1810), a worn fragment, so identified 

 bj'' Dr. Stimpson. 



Pleurotoma cerina, Ktz. and Stm. 



Dredged. 

 Pleurotoma plicata, C. B. Ad. 



Dredged. 

 Marginella apicina, Menke. 



Dredged, and frequently found on the beach. 

 Oliva litterata, Lam. 



Very common ; called " Key-shells," 

 Olivella mutica, Say. 



Very abundant ; "Bead-shells." 

 Columbella avara, Say. 



Common ; beach, shoals, and dredged in A^arious parts of the 

 harbor. "Some are of unusually bright colors." 



Columbella ornata, Ravenel ? 



Several specimens. 

 Columbella lunata, Say. 



Several specimens dredged. 

 Dolium galea, Linn. 



Beach, frequent. 

 Semicassis granulosa, Brug. 



Common. 



Cassis cameo, Stm. 



Common ; but I never saw it alive, and nearly all the specimens 

 noticed were worn, and usually also with slate discoloration. 



Purpura floridana, Conr. 



Rare, I should judge, having obtained but few specimens — Xos. 

 115T and 2588 (a broken one), and two live ones, 



Ilyonassa obsoleta. Say. 



I should judge this to be the most abundant shell of this 

 locality, LittoiHna, even, not excepted. - Mj-riads cover the sand- 



1871.J 



