Looks like you've found the shell of a Terebra expiravitia, a sort of spooky sea snail ghost -- the body of which is made entirely of cold ectoplasm, and therefore is indistinguishable from a regular alive sea snail.
(In-game plural: gray seashells)
Item number: 10268
Description ID: 959980778
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|You hold the ghost snail shell up to your ear... most seashells are empty because the inhabitants died, but this one was dead already. It gives you the most horrifying wet willy you've ever imagined, and then vanishes.|
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