NORTHWEST COAST MARINE SHELLBEARING MOLLUSKS. 21 



Superfamily ANOMIACEA. 

 Family ANOMIIDAE. 



Genus ANOMIA Linnaeus, 1758. 



ANOMIA PERUVIANA Orbigny, 1846. 



Voy. Ainer. Mer., p. GT3. — I'hilippi, Abb. u. Beschr., vol. 3, p. 211, pi. 1, fig. 2. 

 San Pedro, California, to Peru and the Galapagos Islands. 



Genus PODODESMUS Philippi, 1837. 



Subgenus Monia Gray, 1849. 



MONIA MACROSCHISMA Deshayes, 1839. 



Revue Zool. Soc. Cuvierienne, p. 359. — Gu^rin, Mag. de Zool., 1S41, pi. 34. 



Southern Bering Sea from the Pribilof Islands, to Japan and the Okhotsk 



Sea on the west, and eastward along the whole coast to Lower California. 



Superfamily MYTILACEA. 



Family MYTILIDAE. 



Genus MYTILUS Linnaeus, 1758. 



MYTILUS CALIFORNIANUS Conrad, 1837. 



Journ. Acad. Nat. Sci. l'hila., vol. 7, p. 242, pi. 18, fig. 15; Conch. Icon. 



Mytilus, pi. 1, fig. 2. 

 Unalaska, Aleutian Islands, eastward and southward to Socorro Island. 



MYTILUS EDULIS Linnaeus, 1758. 



Syst. Nat., ed. 10, p. 705.— Gould. Inv. Mass., tig. 82. 



Arctic Ocean to Cerros Island, and worldwide in temperate waters. 



Section H0RM0MYA Morch, 1853. 

 MYTILUS ADAMSIANUS Dunker, 1856. 



Proc. Zool. Soc, p. 3G0 ; Conch. Icon. Mytilus, pi. 11, fig. 55. 



Santa Barbara, California, to Panama and the Galapagos Islands. 



MYTILUS RECURVUS Rafinesque, 1820. 



Ann. Gen. Sci. Phys., vol. 5, p. 320. — Say, Amer. Conch., pt. 5, pi. 50. 

 Newport, California, introduced with seed oysters from the Atlantic. 



Genus SEPTIFER Recluz, 1848. 



SEPTIFER BIFURCATUS (Conrad) Reeve, 1837. 



Journ. Acad. Nat. Sci. Phila., vol. 7, p. 241, pi. 18, fig. 14. 

 Crescent City, California, to Gulf of California. 



SEPTIFER BIFURCATUS OBSOLETUS Dall, 1916. 

 Proc. U. S. Nat. Mus., vol. 52, p. 404. 

 San Diego, California. 



Genus MODIOLUS Lamarck, 1799. 



MODIOLUS MODIOLUS Linnaeus, 1758. 



Syst. Nat., ed. 10, p. 706 : Conch. Icon., Modiola, pi. 1, fig. 2. 

 Circumboreal. On the Pacific side Arctic and Bering Seas and southward 

 to San Pedro, California, and the outlying islands. 



