Plate coral (Fungia fungites), also known as Disk coral. Family Fungiidae. These are solitary non-reef-building corals.ese are solitary non-reef-building corals.
A Keyhole Sand Dollar, genus Mellita, a species of Sea Urchin. These marine createures belong to the order Clypeasteroida.
A starfish. There are many species and exact identification is difficult. Genus Linckia, family ophidiasteridae.