ShellSanibel
Read the beach.
Fasciolaria tulipa
occasional · 3–6 in (8–15 cm)
Larger and more strongly coloured than the banded tulip — orange, brick and grey mottling with irregular dark spiral threads.
Banded tulip. The rule of thumb is tidy thin lines banded, messy mottling true.
Gulf beaches after weather; less frequent than its banded cousin.
Often alive. It eats other molluscs, including the banded tulip.
That includes anything with the animal still in it, and sand dollars, sea stars and urchins whether or not they look alive. If it moves, if it closes, if it is anchored to the sand — put it back where you found it, the right way up.
A shell with an animal in it is not a souvenir that has been left out. It is the animal’s house, and the beach is not producing spares.