134 PROCEEDINGS OP THE ACADEMY OP 



Modiola plicatula, Lam. 



Yery abundant, in the muddier parts of the marsh, below high- 

 water mark, and thence part way out to the beach ; but no live 

 ones seen in the sand of the beach itself. In the former situa- 

 tions, the shells closely assimilate in color to the ground in which 

 they are partly imbedded ; in the sand, they are clearer, and show 

 the purplish hues. The larger ones are generally found singly, 

 anchoi'ed to bits of stick, the roots of plants, etc.; the smaller, in 

 masses, along with Ilytilus, adhering to plats of raccoon oysters, 

 the stones of the wharves at Beaufort, and the jutties of rock 

 on the beach. 



Modiola americana, Leach. 



Rather uncommon, on the beach only; none found alive, and 

 most somewhat worn. 



" Krebs gives 'J/, americana Tarvart d'Herbigny (if. ameri- 

 cana Leach ? M. tulipa Link, etc.)' and does not quote M. tulipa 

 otherwise. Stimpson gives in the Check List M. americana 

 (Leach), and among the doubtful species, 31. tulipa Lam. In the 

 Beaufort List, he gives both M. americana and 'If. tulipa.'' " 



Modiola castanea, Say ? 



A single specimen, dredged alive in the channel. 



"I have never seen an authentic specimen of this species, which 

 Kurtz in his catalogue gives only from S. C. It seems to differ 

 from M. americana, and to agree exactly with Say's description." 



Hytilus caroliuensis. 



Abundant ; adhering in masses to rocks and bunches of oys- 

 ters. 



Mytilus edulis, Linn. 



Beach. 

 Mytilus cubitus, Say. 

 Cliama aroiuella, Linn. 



Beach ; rather uncommon. 

 Chama macrophylla, Chemn. 



Beach and elsewhere, abundant. Dr. Stimpson informs me 

 that this is near its northern limit. 



Cardium magnum, Born. 



The most conspicuous shell on the beach, by reason of its size 



[July 18, 



