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The close affinities of Rhizocrinus with Apiocrinoids are further exemplified by the fact that when the animal dies, it casts off its arms, like Apiocrinus, the head of which is generally found without arms. And now the question may be asked, what is the meaning of the occurrence of these animals in deep waters at the present day, when, in former ages, similar types inhabited shallow seas?
Section at Bradford of Great Oolite and overlying clay, containing the fossil encrinites. Three perfect individuals of Apiocrinites, represented as they grew on the surface of the Great Oolite. d. Body of the Apiocrinites rotundus. Apiocrinus. a. Single plate of body of Apiocrinus, overgrown with serpulae and bryozoa. Natural size. Bradford Clay. b.
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