40 BULLETIN 112, UNITED STATES NATIONAL MUSEUM. 



Subgenus Laevicakdium Swainson, 1840. 



LAEVICARDIUM ELATUM Sowerby, 1833. 



Proc. Zool. Soc, p. S4; Conch. 111. Carditun, fig. 3. 

 San Pedro, California, south to Panama. 



LAEVICARDIUM SUBSTRIATUM Conrad, 1837. 



Journ. Acad. Nat. Sci. Phila., vol. 7, p. 228, pi. 17, fig. 2. 

 Catalina Island and San Pedro, California, to Acapulco. / 



Genus SERRIPES Beck, 1841. 



SERRIPES GRONLANDICUS Gmelin, 1792. 



Sy.st. Nat., vol. 7, p. 3232; Binney's Gould's Inv. Mass., p. 145, fig. 404. 

 Circumboreal. Arctic Seas and south to Hakodate, Japan, and Puget 

 Sound. 



SERRIPES LAPEROUSII Deshayes, 1839. 



Rev. Zool. Soc. Cuvierienne, p. 360.— Guerin, Mag. de Zool., Moll., pi. 48, 



1841. 

 Bering Strait to Hakodate, Japan, and Sitka, Alaska. 



Genus PROTOCARDIA Beyrich, 1845. 



PROTOCARDIA CENTIFILOSA Carpenter, 1864. 



Suppl. Rep. Brit. Assoc, p. 642; Univ. Cal. Zool. Publ., vol. 14, pi. 20, 



fig. 2 a-d. 

 Bodega Bay to Lower California. 



PROTOCARDIA CENTIFILOSA RICHARDSONII WhUeavcs, 1878. (Plate 2, fig. 3.) 



Canadian Nat., ser. 2, vol. 8, p. 469. 

 Queen Charlotte Islands to San Francisco. 



Family VESICOMYACIDAE. 

 Genus VESICOMYA Dall, 1886. 



VESICOMYA OVALIS Dall, 1896. 



Proc. U. S. Nat. Mus., vol. 18, p. 18 ; Bull. Mus. Conip. Zool., vol. 43, p. 417. 

 Clarence Strait, Alaska, 322 fathoms, and in Panama Bay, in 1.672 fathoms. 



VESICOMYA LEPTA Dall, 1896. 



Proc. U. S. Nat. Mus., vol. 18, p. 17 ; Bull. Mus. Comp. Zool., vol. 43, p. 416, 



pi. IS, figs. 12, 14. 

 Off Tillamook, Oregon, and south to the Gulf of California, in deep water. 



VESICOMYA STEARNSII Dall, 1895. (Plate 1, figs. 6, 7.) 



Proc. U. S. Nat. Mus., vol. 17, pp. 693, 696, fig. 1 A; vol. 18, p. 17. 



Off La Jolla, California, and south to the Gulf of California, in deep water 



Subgenus Archivesica Dall, 1908. 



ARCHIVESICA GIGAS Dall, 1896. 



Proc. U. S. Nat. Mus., vol. 18, p. 18 ; Bull. Mus. Comp. Zool., vol. 43, p. 418, 



pi. 16, fig. 9. 

 Off Point Sur, California, and in the Gulf of California, in deep water. 



