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 Gemminae. 
Genus GEMMA Deshayes, 1853. 
GEMMA GEMMA Totten, 1834. 
Amer. 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 Dali, 1902. 
PSEPHIDIA LORDI Baird, 1863. 
Proc. 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 Dali, 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 Dali, 1913. (Plate 3, figf. 2.) 
Proc. U. S. Nat. Mus., vol. 45, No. 2002, p. 593. 
Santa Barbara Islands, California, to Gulf of California. 
PSEPHIDIA BRUNNEA Dali, 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 Peteicolaeia Stoliczka, 1870. 
PETRICOLARIA DENTICULATA Sowerby. 1834. 
Proc. Zool. Soc., p. 46; Conch. Petricola, p. 773, pi. 166, figs. 6, 7. 
Monterey to Payta, Peru. 
