Some thought this would be fun however, egg cases shouldn't be use for fun. Leave them where you find them on the beaches unless the rattle when you shake them.
Cuban-Helicinid genus Priotrochatella Fischer, 1893. These snails are very, very beautiful and, to say the least, they are very peculiar. On Cuba three species have been reported, all from the Isle of Pine.
Snails Dictionnaire universel d'histoire naturelle. v. 3 1849 - Atlas (Zoologie-Botanique) Paris