Epitonium angulatum (Say, 1831)

(An Olivella glides by as an Epitonium angulatum (Say, 1831) keeps watch)  Olivella mutica has a conspicuous siphon, a broad propodium and metapodia, but lacks eyes.  Epitonium angulatum  has an utterly different anatomic floor plan.
Olivella mutica (Say, 1822) Variable Dwarf Olive
Little Talbot Island State Park, Duval County, FL (about 8 mm.)