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 I have something similar that looks like a slug with a too-small shell.  It's harmless, but sorry, don't remember the name of the sucker (he, he).  Started with one that came in on some LR, now I have several crawling around. 
				__________________If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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