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Padilla Bay National Estuarine Research Reserve. The Mud Snail, Batillaria attramentaria, is abundant on soft mud or high intertidal zones of quiet baysand estuaries from Boundary Bay, British Columbia, to Elkhorn Slough, California. The shell is long, slender, and about 35mm long. It was introduced fromJapan to the U.S. and is common where Japanese oysters were planted.