Shell from Dr for Identification please !!

[patdom]

<a href="http://www.badongo.com/es/pic/6198369" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/es/pic/6198369">http://www.badongo.com/es/pic/6198369</a><!-- m --></a>
<a href="http://www.badongo.com/es/pic/6198383" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/es/pic/6198383">http://www.badongo.com/es/pic/6198383</a><!-- m --></a>
<a href="http://www.badongo.com/es/pic/6198368" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/es/pic/6198368">http://www.badongo.com/es/pic/6198368</a><!-- m --></a>
<a href="http://www.badongo.com/es/pic/6198313" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/es/pic/6198313">http://www.badongo.com/es/pic/6198313</a><!-- m --></a>
<a href="http://www.badongo.com/es/pic/6198387" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/es/pic/6198387">http://www.badongo.com/es/pic/6198387</a><!-- m --></a>
<a href="http://www.badongo.com/es/pic/6198370" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/es/pic/6198370">http://www.badongo.com/es/pic/6198370</a><!-- m --></a>

All these shells have been collected diving at 30ft approximately in Samana on the north coast of the Dominican rep.
Thanks for your help..I am very new in shells identification although I have been collecting shells for a while...30 years!!