Help with id please

[paul monfils]

Well, every cowrie starts out life this way, and grows this way until it reaches close to its full adult size.  So in that sense it is pretty common.  But good specimens in this stage are not too common as beach specimens because they are so thin and fragile that they tend to get broken up by surf.  When they do reach adult size, the thin lip curls under to form the typical cowrie aperture, the teeth begin to form along the aperture, and the adult pattern starts to be laid down over the immature banded pattern.