42 BULLETIN 112, UNITED STATES NATIONAL MUSEUM. 



Genus SAXIDOMUS Conrad, 1837. 



SAXIDOMUS NUTTALLII Conrad, 1837. 



Journ. Acad. Nat. Sci., Phila., vol. 7, p. 249, pi. 19, fig. 12. 

 Baulinas Bay, California, to San Diego. 



SAXIDOMUS GIGANTEUS Deshayes, 1839. 



Revue Zool. Soc. Cuvierienne, p. 359.— Guerin, Mag. de Zool. Moll., 1841, 



pi. 43 ; Bull. U. S. Fish Comm., vol 3, p. 355, fig. 2. 

 Aleutian Islands from Attu eastward and south to Monterey, California. 



SAXIDOMUS GIGANTEUS BREVIS Dall. 1916. 



Proc. U. S. Nat. Mus., vol. 52, No. 2183, p. 413. 

 Admiralty Island, Alaska, to Tacoma, Washington. 



Subfamily Venerinae. 

 Genus CHIONE Megerle, 1811. 



CHIONE FLUCTIFRAGA Sowerby, 1853. 



Thes. Conch. Venus, p. 712, pi. 154, figs. 42, 43. 

 San Pedro, California, to the Gulf of California. 



CHIONE UNDATELLA Sowerby, 1835. 



Proc. Zool. Soc, p. 22 ; Thes. Conch., Venus, p. 711, pi. 153, fig. 22. 

 San Pedro, California, and south to Guayaquil. 



CHIONE SUCCINCTA Valenciennes, 1832. 



Humboldt and Bonpland, Obs. Zool., p. 219, pi. 48, figs. 1 a-e. 

 San Pedro, California, to Panama. 



Genus VENUS (Linnaeus) Lamarck, 1799. 



VENUS KENNICOTTII Dall, 1871. 



Araer. Journ. Conch., vol. 7, p. 147, pi. 16, fig. 1 ; Proc. U. S. Nat. Mus., vol. 



24, p. 560, pi. 40, fig. 7, 1902. 

 Neah Bay, Washington, to Little River, Mendocino County, California. 



Genus MARCIA H. and A. Adams, 1857. 



MARCIA KENNERLYI (Carpenter) Reeve, 1863. 



Conch. Icon. Venus, sp. 41; Proc. U. S. Nat. Mus., vol. 26, p. 396, pi. 14, 



fig. 1. 

 Kodiak Island, Alaska, to Carmel Bay, California. 



Section VENERELLA Cossmann, 1886. 

 MARCIA SUBDIAPHANA Carpenter, 1864. 



Suppl. Rep. Brit. Assoc, p. 640 ; Proc. U. S. Nat. Mus., vol. 14, p. 185, pi. 7, 



figs. 5, 6. 

 Sannakh Islands, Alaska, to the Santa Barbara Islands, California. 



Genus PAPHIA Bolten, 1798. 



Subgenus Protothaca Dall, 1902. 



