I did some poking around and found that also -
Just a suggestion, there may be another possibility if newportcatch doesn't have a whelk in their tank, and that might be a king conch. http://www.jaxshells.org/nsmx.htm
right on the money.!!!!!!!! I just brought home one of these from Florida but pulled it out of my reef tank when I read it was carnivorous.i guess it left a present behind. I have now re-united themin another tank.