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

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

Opercular disc (1) retracted to expose a little of the underside of the operculum (2). Disc sometimes extends a little beyond edge of operculum (see 28 Littorina compressa. 9.6mm high. North coast of Anglesey, Wales. March 2015. ).
Recently expelled faecal pellets on foot.