41. Cross-sections of corals and crinoids can be see in the Gold Vein type. 42. They filtered food particles from the water and are the rarest part of the crinoid . 43. Crinoids are relatively free from predation.44. Crinoids are characterised by a mouth on the top surface that is surrounded by feeding arms.45. Inspired, he devoted all his energies to the continued collection and study of crinoid fossils. 46. The "'Myzostomida "'are an order of small parasitic on crinoids . 47. It is also possible to see the spot where the stem attached to the crinoid ball. 48. The marine life of Ohio included crinoids , snails, cephalopods, brachiopods, and fishes. 49. Crinoids lost all but one family.50. The crown has ossicles scattered throughout the connective tissue ( crinoids have no distinct dermis ).
