Tiny purple sea snail

Sometimes I think the most abundant things may get ignored… these little purple/blackish guys were everywhere, tons of them, but I'm having a bit of trouble finding a good id for them

Success… found a comparison that listed the stripe in the eye stalk as an indicator for Littorina plena

The Littorina plena

''Littorina plena'' is a species of sea snail, a marine gastropod mollusk in the family Littorinidae, the winkles or periwinkles.{{WRMS species|445659|''Littorina plena'' Gould, 1849|||Reid, David G. . Littorina plena Gould, 1849. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=445659 on 6 June 2010}}

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Similar species: Littorinimorpha

Species identified by morpheme