44 BULLETIN 112, UNITED STATES NATIONAL MUSEUM. 



Genus VENERUPIS Lamarck, 1818. 



VENERUPIS LAMELLIFERA Conrad, 1837. 



Journ. Acad. Nat. Sci. Phila., vol. 7, p. 251, pi. 19, fig. 19. 

 Monterey to San Diego, California. 



Subfamily GrE m m i xae. 

 Genus GEMMA Deshayes, 1853. 



GEMMA GEMMA Totten, 1834. 



Arner. Journ. Sci., vol. 26, No. 2, p. 367, fig. 2. 



San Juan Islands to San Francisco Bay. Introduced from the Atlantic 



Coast with "seed" oysters. (San Diego?) 



Genus PSEPHIDIA Dall, 1902. 



PSEPHIDIA LORDI Baird, 1863. 



Proe. Zool. Soc, p. 69, pi. 2, fig. 10: Proc. U. S. Nat. Mus., vol. 26, pi. 16. 



fig. 5. 

 Unalaska, Alaska, to Coronado Islands. 



PSEPHIDIA OVALIS Dall, 1902. 



Proc. U. S. Nat. Mus., vol. 26, p. 407, pi. 16, fig. 4. 



St. Paul Island, Bering Sea, to San Diego, California. 



PSEPHIDIA CYMATA Dall, 1913. (Plate 3, fig. 2.) 



Proc. U. S. Nat. Mus., vol. 45, No. 2002, p. 593. 



Santa Barbara Islands, California, to Gulf of California. 



PSEPHIDIA BRUNNEA Dall, 1916. 



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



Monterey, California, to San Ipolito Point, Lower California. 



? PSEPHIDIA SALMONEA Carpenter, 1864. 



Suppl. Rep. Brit. Assoc, p. 641 ; Proc. Cal. Acad. Sci., vol. 3, p. 209. 

 Catalina Island to San Diego, California. 



Family PETRICOLIDAE. 

 Genus PETRICOLA Lamarck, 1801. 



PETRICOLA CARDITOIDES Conrad, 1837. 



Journ. Acad. Nat. Sci. Phila., vol. 7, p. 255, pi. 20, fig. 8. 

 Vancouver Island to Magdalena Bay, Lower California. 



Subgenus Petricolaeia Stoliczka, 1870. 



PETRICOLARIA DENTICULATA Sowerby, 1834. 



Proc. Zool. Soc, p. 46; Conch. Petrieola, p. 773, pi. 166, figs. 6, 7. 

 Monterey to Payta, Peru. 



