I agree it does appear very whelk like, would it be possible to get some clear shots of the aperture with snail/whelk retracted, and one top down with the snail/whelk out?
I think I found your guy, Coralliophila, possibly Coralliophila Parva. Check this page. Just a guess from an amateur. Click on the pics for a closer view. I'm not sure where this species comes from, and that will have alot to do with whether or not I'm even remotely correct.
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