NATURAL SCIENCES OF PHILADELPKIA. 141 



Crepidnla convexa, Say. 



Commou. 

 Crepidula unguiformis, Say. 



Commou ; dead, an^^where; and alive, adhering to the inside of 

 shells, such as Neverita, etc. 



Fissurella altemata, Say. 



Common ; chief!}'' on the beach. 



Zizyphinus, sp. 



Yery rare; a single specimen, dead, on the beach (No. 2516). 

 Turbo crenulatus, Gm. ? 



A single worn, incrusted specimen (No. 2595), from the beach, 

 evidently transported from a distance. 



"Exactly like Cuban specimens marked T. Mppocastaneus =^ 

 T. castaneus (Chemn.), which, however, I do not find recorded 

 from our coast." 



Littorina irrorata, Say. 



Extremely abundant, in the marsh; generally seen crawling 

 up the culms of reeds and grasses, from which they drop at a 

 touch. During summer they are so numerous in some places, 

 that they almost give color to the herbage, 



Scalaria humphreysii, Kiener. 



"Blood-shells," so called often, from the purplish color of the 

 soft parts that appear at the opening. Yery abundant, chiefly on 

 the beach, where occasionally they may be found touching each 

 other, if not heaped. The purity of color and pleasing form of 

 this shell render it a great favorite for those peculiarly ugly fab- 

 rications called " shell-frames." 



Scalaria lineata, Say. 



Common everywhere. 



Solarium granulatum, Lam. 

 Vermetus radicula, Stimps. 

 Common. 



CeritMum, sp. 



Some specimens, as 1*782, which apparently Mr. Smith did not 

 receive, were mentioned to me by Dr. Stimpsou as '■^ Cerithium 

 ferrugineum ?" 



18T1.] 



