.NATURAL SCIENCES OP PHILADELPHIA. 135 



and striking variegated colors, as well as its abundance. Dead 

 shells are strewn everywhere; and live ones (mostly young) may 

 be found in every part of the harbor. 



Cardium muricatum, Linn. 

 Beach ; rather common. 



Cardium isocardia, Linn. 

 Beach ; common. 



Liocardium laevigatum, Lam. 



Beach ; not uncommon ; almost always worn, and with slate 

 or blackish discoloration. 



'■'' Cardium Isevigatum Lam. is given hy Hanley as a syn. of C 

 serratum (Linn.), and G. Isevigatum (Penn., and Linn?) as = 6'. 

 serratum Lam. The first named is our species, the other coming 

 from England." 



Liocardium mortoni, Conn. 



Dredged, and on the beach ; but apparently not abundant. 



Lucina strigilla, Stimp. 



Extremely abundant everywhere ; but no live ones seen. This 

 is a favorite with the population in the vicinity for what they 

 consider ornamental purposes — as, to paste on picture-frames, 

 along with Donax variabilis, Tellina alternata, Sigaretus per- 

 spectivus, and Scalaria humphreysii. 



Lucina chrysostoma {L. radula of Kurtz's list). 



Very common, beach and elsewhere ; no live ones seen. 



Diplodonta ? punctata, Say. 



Dredged. 

 Astarte lunulata, Conr. 



Dredged ; apparently rare. 



Cardita tridentata, Say. 



Dredged, one or two specimens. 



Mercenaria violacea, Schum. 



The representative species, and extremel}' common. 



Mercenaria violacea var. notata. 



Several specimens, among numbers of round clams indiscrimi- 

 nately gathered. 

 1871.] 



