shell identification help

[newshell]

Dear all,
Whenever I went to the beach, I always like to collect or buy some shells for souvenir, now I realised that I don't have any information on those shells, would appreciate if any of you can help me to id the shell and possibly the family, base on those information then I can further search for information about those shells.
Please find below the link to the picture of some of the sheels..Thanks in advance for your kind assistance.

<a href="http://neutokoi.badongo.com/gallery/10889/0" target="_blank"><!-- m --><a class="postlink" href="http://neutokoi.badongo.com/gallery/10889/0">http://neutokoi.badongo.com/gallery/10889/0</a><!-- m --></a>

Rgds,
Edo