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FMIB Rock Snails Purpura lapillus devouring barnacles upon rock at Annisquam Mass.jpeg Rock Snails Purpura lapillus devouring barnacles upon rock at Annisquam Mass Subject Snails Barnacles Tag Mollusks Cite book SeaShore Life the Invertebrates of the New York Coast and the Adjacent Coast Region Mayer Alfred Goldsborough New York