Tiny Waist (Banded Tulip)
4" X 6"
It's amazing to me that this shell is intact. The spindle-y center is so thin! Yet, here it is with an entire spire!
At first, I though that this could be one of the rare juonia shells, but the dot coloration is too irregular. Plus, they aren't really supposed to be in the Keys. The coloration is similar to the alphabet cone, but the shape is wrong. It might not be a banded tulip at all, but that seemed most likely.