Live shell ID please...

Anyone have any idea the name of this live shell? I couldn't find it in the Reef Creature ID book..

Photographed on a night dive in Palm Beach, Florida. Salt water! For those who think I might be scuba diving with the gators as a past time now. ;D

It's a moon snail in the family Naticidae, probably a Polinices. Unless someone else comes up with a name I'll head over to the malacology department & look through a few references for it.

My guess - and remember I am not a shell person - is Natica canrena.

See http://fm1.fieldmuseum.org/aa/Files/bieler/gastphyl.html and http://www.seaslugforum.net/display.cfm?id=10877 for images of living animals that show the same general pigmentation on the mantle as your critter. The color on the shell is quite variable - do a google image search to see various images of just the shell.