ID Help, please

[mary ellen]

Please help me to identify these shells.

<a href="http://www.badongo.com/pic/8805195" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/pic/8805195">http://www.badongo.com/pic/8805195</a><!-- m --></a>
<a href="http://www.badongo.com/pic/8805196" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/pic/8805196">http://www.badongo.com/pic/8805196</a><!-- m --></a>
I'm familiar with the scorpion conch, but these have many more spines radiating out.

<a href="http://www.badongo.com/pic/8805196" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/pic/8805196">http://www.badongo.com/pic/8805196</a><!-- m --></a>
About 6 inches long.

<a href="http://www.badongo.com/pic/8805199" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/pic/8805199">http://www.badongo.com/pic/8805199</a><!-- m --></a>
<a href="http://www.badongo.com/pic/8805200" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/pic/8805200">http://www.badongo.com/pic/8805200</a><!-- m --></a>
3 inches long.  Some type of auger?

<a href="http://www.badongo.com/pic/8805201" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/pic/8805201">http://www.badongo.com/pic/8805201</a><!-- m --></a>
<a href="http://www.badongo.com/pic/8805202" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/pic/8805202">http://www.badongo.com/pic/8805202</a><!-- m --></a>
This shell is very beachworn.  Perhaps a murex?

Thanks for your help!