Common Periwinkle Small 230×320 Medium 461×640 Large 737×1024 Download Tiff Original 1727×2400 | (1.1 MB) Description The common periwinkle (Littorina littorea) is an edible species of sea snail in the Littorinidae family of the winkles. Keywords common periwinkle, Gastropod, Littorina littorea, Littorinidae, mollusc, mollusk, sea snail, seashell, snail shell, Winkle Galleries Snails and Slugs Source: William Dwight Whitney The Century Dictionary: An Encyclopedic Lexicon of the English Language (New York, NY: The Century Co., 1911)