another Trochidae identification request

[shell collector de]

Hello again
At the attached picture you will find some shells which I soppose belong to the Trochus genus.

<a href="http://www.putfile.com/pic.php?img=5646047" target="_blank"><img src="http://img2.putfile.com/thumb/6/16010583937.jpg" alt="http://img2.putfile.com/thumb/6/16010583937.jpg" style="border:0" /></a>

The height of these shells is up to 15 mm and the diameter is 10 mm. There is no umbilicus present.

Maybe you can help my identifying these shells.

Thank you  <span class="petit">--Last edited by wolfgang.j.braun on 2007-06-10 16:59:18 --</span>