41 



Family Mytilid^e, Cuv. 

 Genus Mytilus, Auct. 

 M. Modiolus, Auct. 



In deep water ; common. 



M. marmoratus. 



Modiolus marmoratus, Forbes. 



Myt. discors, Mont. 



Imbedded in the outer skin of Ascidise in deep water; common. 



M. discrepans, Auct. 



With the last, and occasionally free ; common. 



Family Arcade, Flem. 



Genus Pectunculus, Lam. 



P, pilosus. Lam. 

 In deep water. A single valve only occurred to me. 



Genus Nucula, Lam. 



N. margaritacea, Lam. 

 In deep water ; common. 



N. erosa, (N. S.) 

 With the last ; rare. 



N. nitida, Sowerby's Conch. 111. f. 20. 

 With the last; rare. 



N. minuta, Flem. 



With the last ; not common. 



Family Conchacea, Lam. 



Genus Cardium, Auct. 



C. edule, Auct. 



On the beach at low water mark ; not common 



F 



