Over a million H. ulvae live on the wet sand in this image of a small part of the mouth of the Dee Estuary, Cheshire. (Random sample had 4737 / sq. metre) When the water dries up they retreat below the sand surface. All examined had deep shell sutures.

Submitted by Ian Smith on Tue, 30/08/2011 21:44
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I.F. Smith
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