Family Littorinidae Littoraria nebulosa (Lamarck, 1822) Cloudy periwinkle - 25 mm Shell with five or six rounded whorls. Sutures slightly indented. Sculpture of incised spiral lines on entire shell. Well-defined parietal shield tinged with mauve. Color grayish-white to gray with irregular brown markings. Earlier whorls usually dark-brown, aperture yellow within.
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