86 Journal of the Mitchell Society \_August 



pi. 71, figs. I, 3, 1889; Dall, Trans- Wagner Inst. Sci., vol. 3, pt. 6, p. 131 1, 

 1903. 



The species may be easily obtained at or near the surface on 

 muddy or shelly bottom between tide marks almost anywhere in 

 the vicinity. Very abundant. 



FAMILY CARDIID^. 

 Genus Cardium (Linnseus) Lamarck. 



Subgenus Trachycardium M5rch, 1853. 



Cardium (Trachycardium) isocardia Linnaeus. 



< Cardium isocardia Linnaeus, Syst. Nat., Ed. 10, p. 679, 1758; Dall, 

 Bull. 37, U. S. Nat. Mus., p. 52, 1889. 



Cardium (Trachycardium) isocardia, Dall, Trans. Wagner Inst. Sci., 

 vol. 3, pt. 5, p. 1085, 1900. 



The living animal has been dredged, during 1912, near the 

 eastern end of Bogue Sound. 



Cardium (Trachycardium) muricatum Linnseus. 



Cardium muricatum Linnaeus, Syst. Nat., Ed. 10, p. 680, 1758; Dall, 

 Bull. 37, U. S. Nat. Mus., p. 52, 1889. 



Cardium (Trachycardium) muricatum, Dall, Trans. Wagner Inst. Sci., 

 vol. 3, pt. 5, p. 1089, 1900. 



The species has been collected in the vicinity of Pivers 

 Island, at the railroad pier at Morehead City, and dredged near 

 the eastern end of Bogue Sound. 



Subgenus Dinocardium Dall, 1900. 



Cardium (Dinocardium) robustum Solander. 



Cardium robustum Solander, Portland Catalogue, p. 58, 1786, after 

 Lister, Hist. Conch., pi. 328, fig. 165, 1770. 



Cardium magnum, Dall, Bull 37, U. S. Nat. Mus., p- 52, 1889. 



Cardium (Cerastoderma) robustum, Dall, Trans. Wagner Inst. Sci., 

 vol. 3, pt. 5, p. 1099, 1900. 



Living animals have been found on Bird Shoal in Beaufort 

 Harbor. The valves of this species are the most conspicuous 

 ones on the seashore at Fort Macon. 



Subgenus Laevicardium Swainson, 1840. 



Cardium (Laevicardium) mortoni Conrad. 



Cardium mortoni Conrad, Journ. Acad. Nat. Sci. Phila., vol. 6, p. 259, 

 pi. 10, figs. 5, 6, 7, 1830. 



