Brittle Stars are closely related to Starfish. They crawl across the seafloor using their flexible arms for locomotion. They generally have five long slender, whip-like arms which may reach up to 60 centimetres in length. They are also known as serpent stars.
I saw many Brittle Stars in a tidal pool at Neil Island. They seemed to be fairly common there. Every time they sensed someone approaching them, they would crawl under a crevice in the rocks.