Merryn Thomas / Looking out over Round Island Lighthouse on a stormy day on St. Martin's, Isles of Scilly, UK, January 2012.
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Adrian Davies / Lightning whelk shell (Busycon contrarium / pulleyi) from Calda Channel, Key West, Florida, USA
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LYNN M. STONE / Egg case of Lightning whelk {Busycon pulleyi} amongst shells, Florida, USA
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Joel Sartore / Photo Ark / Group of Eastern white slippersnails (Crepidula plana) inside shell of Lightning whelk (Busycon contrarium), Gulf Specimen Marine Lab and Aquarium.
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Joel Sartore / Photo Ark / Group of Eastern white slippersnails (Crepidula plana) inside shell of Lightning whelk (Busycon contrarium), Gulf Specimen Marine Lab and Aquarium.