Crinoid - Himerometra robustipinna, sometimes known as Featherstars. The name comes from the Greek word krinon, "a lily", and eidos, "form". They usually host other small critters like shrimps, squat lobsters and clingfishes. Pic#1 shows one at rest, with its arms curled up showing its underside which has markings that makes interesting geometric designs. Pics #2 and #3 are usually the 'position' they are seen.