Identification help

[dannie]

This shell seems unusual to me, anybody recognizes it?
I don't remember where I found the shell.

I posted the pictures at
<a href="http://www.badongo.com/pic/3843316" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/pic/3843316">http://www.badongo.com/pic/3843316</a><!-- m --></a>
<a href="http://www.badongo.com/pic/3843339" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/pic/3843339">http://www.badongo.com/pic/3843339</a><!-- m --></a>

I hope you can see it.

Thanks.

Dannie