Primovula formosa (G. B. Sowerby II in Adams &amp; Reeve, 1848) - Formosa Egg Cowrie; about 1cm
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/76738608@N08">Christian Gloor</a> from Wakatobi Dive Resort, Indonesia
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/christian_gloor/11019793296/">Formosa Egg Cowrie</a>