Need help to identify a shell

[paul monfils]

This is a juvenile Cypraea (cowrie shell).  Once they grow to full size, the outer lip curls inward to form the typical cowrie aperture, and the adult pattern gets laid down over the banded juvenile pattern.  I think it is probably this species, Cypraea zebra:

<!-- m --><a class="postlink" href="http://4.bp.blogspot.com/_mUrs8_mmTUo/SuLs-7HcLYI/AAAAAAAAAIo/xEk6pg_Vwbg/s400/Cypraeazebra.jpg">http://4.bp.blogspot.com/_mUrs8_mmTUo/S ... azebra.jpg</a><!-- m -->

Notice that you can see the banded juvenile pattern under the spotted adult pattern.