These shellfish can be found in Caribbean Sea. They live inside corals and feed from those (Those are horned corals: Bright coloured and stuck to sandy grounds whereas regular corals are stuck to hard grounds). Their approximately 3 cm long shells is covered by orange spots on black, that they can retract when an animal approaches.
This shellfish used to be a currency, and be so called in French. It’s a quite common shellfish but unfortunately picked up too much by divers; that phenomena threatening this specie.