apical view of the shell of <i>Rapana venosa</i>
U.S. Geological Survey Archive
CC BY 3.0 us
<a rel="nofollow" class="external free" href="http://www.insectimages.org/browse/detail.cfm?imgnum=1354023">http://www.insectimages.org/browse/detail.cfm?imgnum=1354023</a> Bugwood.org, background retouched