30 Littorina compressa. 9.2mm high. West coast of Anglesey, Wales. March 2015.

30 Littorina compressa. 9.2mm high. West coast of Anglesey, Wales. March 2015.

Whitish opercular disc (1); sometimes a yellow perimeter, see 31 Littorina compressa. 9.9mm high. North coast of Anglesey, Wales. March 2015. .