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From Wikipedia: "Megathura crenulata, common name the great
A pinkish and quite worn Greek keyhole ...
smallish shell - the inhabitant clings to rocks in the tidal zone
mollusks. The shell is cone-shaped with a
This is an empty version of a very common shell belonging to the snail family ...
spirally coiled, or appears not to be coiled in the adult snails.The Cayenne ...
Saw this while snorkeling at the most southern beach we kayaked to. The beach ...