Common Periwinkle (Littorina littorea)

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AKA Edible Periwinkle

Length The Edible periwinkles is one of the largest periwinkle reaching a size of 2 inches.The width of the shell ranges from 10 to 12 mm at maturity,with an average length of 16–38 mmShell height can reach up to 30 mm,[4] 43 mm or 52 m

Description Edible periwinkles are mostly black and grey, but exhibit a variety of colours and stripes. This is a robust intertidal species with a dark and sometimes banded shell. It is native to the rocky shore.Adult Shells in tend to be smooth with the young ridged Shell is broadly ovate, thick, and sharply pointed except when worn Shell contains six to seven whorls with some fine threads and wrinkles. The color is variable from grayish to gray-brown, often with dark spiral bands. Columella base is white. Shell is lacking an umbilicus. The white outer lip is sometimes checkered with brown patches. Shell interior has a chocolate-brown colour

Rough Periwinkles are adaptable tolerating a range of salinity and exposure and across most beach zones.

 By Photographed by Guttorm FlatabÝ (user:dittaeva). [GFDL, CC-BY-SA-3.0 or CC BY-SA 2.5], via Wikimedia Commons