This spiral sea shell is of the family Architectonicidae. Known as the staircase shells or sundials, they are sea snails, marine gastropod mollusks.
Dried specimen of Diodon holocanthus, long-spined Porcupine FIsh. Porcupine fish are also commonly called blowfish, puffer fish, balloon fish and globefish. They are in the family Diodontidae.
Trapezium Horse Conch, Pleuroploca trapezium, sea shell.