NORTHWEST COAST MARINE SHELLBEARING MOLLUSKS. 185 
Subfamily Fissurellidinae. 
Genus MEGATHURA Niittall (in Pilsbry), 1891. 
MEGATHURA CRENULATA Sowerby, 1825. 
Tankerville Cat., App., p. VI ; Conch. Ulus., Fissurella, fig. 18. 
Monterey Bay to Cerros Island, Lower California. 
Genus MEGATEBENNUS Pilsbry, 1890. 
MEGATEBENNUS BIMACULATUS Dali, 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.) Dali, 1871. 
Amer. Journ. Conch., vol. 7, p. 133, pi. 15, fig. 8. ^ 
Bodega Bay, California, to Magdalena Bay, Lower California. , 
Subfamily Emarginulinae. 
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, aiid Socoro 
Island. 
DIADORA INAEQUALIS Sowerby, 1834. 
Proc. Zool. Soc., p. 126 ; Conch. Ulus., Fissurella, fig. 45. i. 
Santa Barbara, California, to Manta, Ecuador, and the Galapagos Islands. 
j 
DIADORA MURINA (Carpenter MS.) Dali, 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 Dali, 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. 
1 
PUNCrrURELLA GALEATA Gould, 1846. 
Proc. Boston Soc. Nat. Hist., vol. 2, p. 159; Rep. U. S. Expl. Exp., Moll., r 
p. 369, pi. 31, figs. 476, 477. i' 
TJnalaska, 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. 
