Any ideal what may had caused this Cypraea Tigris

[richard]

<a href="http://www.badongo.com/pic/5226648" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/pic/5226648">http://www.badongo.com/pic/5226648</a><!-- m --></a>
<a href="http://www.badongo.com/pic/5226650" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/pic/5226650">http://www.badongo.com/pic/5226650</a><!-- m --></a>
Has anyone ever come across some thing like this in a Cypraea Tigris? Any ideal what may had caused it?
100mm long