Slug-like snail from Florida

Dear Paul,
This is a snail rather than a slug. When we talk of snails and slugs, it can be a bit confusing because in general terms we think of snails as being molluscs with large external shells and slugs as molluscs without shells. But in fact many land slugs and sea slugs have close relatives with large external shells, and many sea snails have close relatives with reduced internal shells.

Your animal is a marine snail of the family Naticidae. I am nnot sure of the species but it is possibly Natica canrena. Members of this family are carnivorous hunters, feeding on other snails and bivalves, often by boring a hole through their shell. The head shield, clearly has the same function as the head shield in the cephalaspidean bubble shells, aiding the animal in burrowing through the sand. However, like the wings of birds, bats and butterflies, the head shields of bubble shells and naticids have evolved independently of each other
Best wishes,
Bill Rudman