NORTHWEST COAST MARINE SHELLBEARING MOLLUSKS. 185 



Subfamily Fisstjrellidinae. 

 Genus MEGATHURA Nuttall (in Pilsbry), 1891. 



MEGATHURA CRENULATA Sowerby, 1825. 



Tankerville Cat., App., p. VI ; Conch. Illus., Fissurella, fig. IS. 

 Monterey Bay to Cerros Island, Lower California. 



Genus MEGATEBENNUS Pilsbry, 1890. 



MEGATEBENNUS BIMACULATUS Dall, 1871. 



Amer. Journ. Conch., vol. 7, p. 132, pi. 15, fig. 7. 

 Forrester Island, Alaska, to Cape San Lucas. 



Genus LUCAPINELLA Pilsbry, 1890. 



LUCAPINELLA CALLOMARGINATA (Carpenter MS.) Dall, 1871. 



Amer. Journ. Conch., vol. 7, p. 133, pi. 15, fig. 8. 



Bodega Bay. California, to Magdalena Bay, Lower California. 



Subfamily Emargintjlinae. 

 Genus DIADORA Gray, 1821. 



DIADORA ASPERA Eschscholtz, 1833. 



Zool. Atlas, pt. 5, p. 21, pi. 23, fig. 5. 



Cook's Inlet, Alaska, to Magdalena Bay, Lower California. 



DIADORA ASPERA DENSICLATHRATA Reeve, 1850. 



Conch. Icon., Fissurella, fig. 64. 



Monterey, California, to San Quentin Bay, Lower California, and Socoro 

 Island. 



DIADORA INAEQUALIS Sowerby, 1834. 



Proc. Zool. Soc, p. 126; Conch. Illus., Fissurella, fig. 45. 



Santa Barbara, California, to Manta, Ecuador, and the Galapagos Islands. 



DIADORA MURINA (Carpenter MS.) Dall, 1885. 



Proc. U. S. Nat. Mus., vol. 8, No. 34, p. 543; vol. 15, p. 197.— Arnold, Pal. 



San Pedro, p. 339. ' 



Crescent City, California, to Magdalena Bay, Lower California. 



Genus PUNCTURELLA Lowe, 1827. 



PUNCTURELLA MAJOR Dall, 1891. 



Proc. U. S. Nat. Mus., vol. 14, p. 189 ; vol. 17, p .712, pi. 26, fig. 4. 

 Pribilof Islands, Bering Sea, and southward to Dixon Entrance, Alaska. 



PUNCTURELLA GALEATA Gould. 1846. 



Proc. Boston Soc. Nat. Hist, vol. 2, p. 159; Rep. U. S. Expl. Exp.. Moll.. 



p. 369, pi. 31, figs. 476, 477. 

 Unalaska, Aleutian Islands, south to Santa Rosa Island, California. 



PUNCTURELLA CUCULLATA Gould, 1846. 



Proc. Boston Soc. Nat. Hist., vol. 2, p. 159; Rep. U. S. Expl. Exp., Moll 



p. 368, pi. 331, fig. 475. 

 Kodiak Island, Alaska, to La Paz, Lower California. 



