wild looking shell found in hawaii

[lief]

any ideas? it appears that there was another half, but it's gone now! not the most beautiful picture, but should do the trick...

thanks!

<a href="http://www.badongo.com/pic/9176597" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/pic/9176597">http://www.badongo.com/pic/9176597</a><!-- m --></a>