| OK,
I heard from Mike, here is the quote:
"I'm fairly certain that it's Ilyanassa, but I've never seen one with the whole spire intact. If it's not Ilyanassa I'm not sure what else it would be. In any case it's definitely a whelk."
Either way it is probably not a snail that will play nice with a lot of baby snails running around. To be on the safe side I would think freezing is the best option.
Brian | 
