NORTHWEST COAST MARINE SHELLBEARING MOLLUSKS. 53 



MYA ARENARIA Linnaeus, 1758. 



Syst. Nat., ed. 10, p. 670; Kinney's Gould's Inv. Mass., p. 55, flg. 375. 



Introduced at San Francisco with "seed" oysters from the Atlantic 



coast. Spread from Victoria, British Columbia, to Monterey California. 



Genus CRYPTOMYA Conrad, 1849. 



CRYPTOMYA CALIFORNICA Conrad, 1837. 



Journ. Acad. Nat. Sci. Phila., vol. 7, p. 234, pi. 17, fig. 11. 

 Chichagoff Island. Alaska, and south to Topolobampo, Mexico. 



Genus SPHENIA Turton, 1822. 



SPHENIA FRAGILIS Carpenter, 1857. 



Mazatlan Cat., p. 24, No. 35, 

 Oregon to Mazatlan. 



SPHENIA OVOIDEA Carpenter, 1864. 



Suppl. Rep. F.rit. Assoc, p. 637; Proc. Acad. Nat. Sci. Phila. for 1S65, p. 54. 

 Aleutian Islands to Paget Sound and San Diego. 



SPHENIA TRTJNCULUS Dall, 1916. 



Proc. U. S. Nat. Mas., vol. 52, No. 2183, p. 415. 

 San Diego, California, to Panama. 



SPHENIA PHOLADIDEA Dall, 1916. 



Proc. U. S. Nat. Mas., vol. 52, No. 2183, p. 41.",. 

 Santa Barbara, California. 



SPHENIA GLOBULA Dall, 1919. 



Proc. U. S. Nat. Mas., vol. 56, No. 2295, p. 570. 

 Monterey, California. 



Genus PLATYODON Conrad, 1837. 



PLATYODON CANCELLATUS Conrad, 1837. 



Journ. Acad. Nat. Sci. Phila., vol. 7, 236, pi. 18, fig. 2. 

 Baulinas Bay, California, to San Diego, California. 



Family CORBULIDAE. 



Genus CORBULA Bruguiere, 1792. 



CORBULA OBESA Hinds, 1843. 



Proc. Zool. Soc, p. M ; Zool. Sulphur^ Voy., Moll., p. 68, pi. 20, fig. 12. 

 Catalina Island, California, to Panama. 



CORBULA FRAGILIS Hinds, 1843. 



Proc. Zool. Soc. p. 56; Zool. sulphur's Voy., .Moll., p. 68, pi. 20, fig. 11. 

 Monterey, California, to Salina Cruz, Mexico. 



CORBULA LUTEOLA Carpenter, 1864. 



Suppl. Rep. Brit. Assoc., p. 637; Proc. CaL Acad. Sci.. vol. 3, p. 207.- 



AENOLD, Pal. San Pedro, p. 181, pi. 17, fig. 11. 

 Monterey, California, to Magdalena Bay. 



