ShellSanibel
Read the beach.
Lettered olive
Oliva sayana
common · 1.5–3 in (4–7 cm)
How to tell it
Glossy, cylindrical, almost polished-looking even fresh off the beach, with fine zigzag markings that suggest handwriting. The spire is short and blunt.
What it gets confused with
Smaller olives and the rice olive are similar in shape but a fraction of the size.
Where it turns up
The wet wash on any Gulf beach. Frequently just under the surface at the waterline rather than sitting on top.
Alive or empty
The animal envelops the shell in life, so a live one looks fleshy and feels slick rather than dry.
Worth knowing
The gloss is natural — that is the animal’s mantle polishing it, not surf wear.
Taking live shells is prohibited in Lee County
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.