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I'd add "beautiful" to the description... it's new to me...I would guess it's a big 'ol honking sea snail, be careful some are poisonous
Yep... yep... I think Tun is correct. Prettiest foot I've seen on one... nice.Shape's wrong for either a cowry or a moon snail and cowries don't have an extended foot like that. The angle's wrong but guessing from the spire & the coloration of the foot I'd say the Atlantic Partridge Tun, Tonna maculosa.