Pretty little bivalve, new to me, any ideas ??

[petergalileo]

Here you go <img src="http://www.seagullparts.co.uk/shell.jpg" alt="http://www.seagullparts.co.uk/shell.jpg" style="border:0" />

Bit smaller than your average sized cockel, much prettier.

Found Harwich, Essex near to the dissused Low Lighthouse on Saturday.

Any ideas ? been looking for shells around the area on and off for 30 years and never found one of these before.

Peter