What kind of shell is this one?

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Please help with identification of this shell. I don t have better image, hope it is real one, not two shells together.
Anyway, knows anybody the name?

<a href="http://www.badongo.com/pic/521546" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/pic/521546">http://www.badongo.com/pic/521546</a><!-- m --></a>

Great site, I have looked for one as this.
Thx for reply
Peter

[paul monfils]

Hi peter,

Welcome to the site. I wish the picture was a little better, but still I'm quite sure this is Glossus humanus (Linne., 1758), commonly known as the Oxheart Clam. It is a European species, fairly common from Norway south to the Mediterranean. A synonym often seen in older books is Isocardia cor. Compare your shell to this picture:

<a href="http://www.thais.it/conchiglie/mediterraneo/schede/sc_00466.htm" target="_blank"><!-- m --><a class="postlink" href="http://www.thais.it/conchiglie/mediterraneo/schede/sc_00466.htm">http://www.thais.it/conchiglie/mediterr ... _00466.htm</a><!-- m --></a>

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hi Paul,
I congratulate on your knowledge,
I think it is exactly that one. Yesterday I did n´t find any info about, so I came here. Your help is very valued.
Thanks from Prague, Czech.Rep.
Peter