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60 feet 600 foot depths Alaska to Baja Alaska to central Alaska to Mexico Alaska to Puget Alaska to southern animal attached to rocks beaches Bering Sea bivalve British Columbia Carpenter central California chiton Clam coast collected Collisella color Columbia to Baja common from Alaska Conrad coralline algae depths of 100 depths of 150 distinguished Eastern Oyster feet from Alaska feet from northern fornia found in depths found intertidally gastropods girdle Gould gravel habitat intertidal area intertidal to 600 intertidal to depths intertidal zone intertidally amongst Islands to Baja Kodiak Island Limpet lives intertidally Macoma Middendorff mollusks Mopalia mud bottoms Nassarius Neptunea northern Baja California northern British Columbia Note operculum oyster periostracum PLATE Puget Sound Queen Charlotte Islands ranges from Alaska ranges from southern rare species ribs San Diego sand or mud southern Alaska southern California Sowerby specimens subtidal tidal uncommon species valves Vancouver Island Washington zone to depths