C. edule or C. glaucum?

[Emma]

Thanks Paul!!

I had a look on a Natural history web page: <!-- m --><a class="postlink" href="http://www.nmr-pics.nl/Cardiidae/album/">http://www.nmr-pics.nl/Cardiidae/album/</a><!-- m -->, and on that page it looks like C. glaucum, but a friend who I went shelling with said that C. glaucum couldn't be found in that area of the Mediterranean.
However, on previous trips, and by consulting the book on Ebro specimens by Brunet I have always come up with the same solution: C. glaucum.

Thanks again!

Best wishes,

Emma.