11 Littorina compressa. 9mm high. West coast of Anglesey, Wales. March 2015.

11 Littorina compressa. 9mm high. West coast of Anglesey, Wales. March 2015.

Ovoid, spiral, translucent, brown operculum with a fine black speckling (1) ; lighter colour where about a third of it is attached to the underlying white opercular disc (2). Yellowish perimeter of disc shows through the translucent operculum (3).