Orders: Zoanthidea, Cereanthidea, Antipathidea, Actiniidea (Sub-orders: Malacactiniae and Scleractiniae or Madreporia).
The order Zoanthidea comprises a number of soft-bodied Zoantharians generally encrusted with sand.
The derivation of the Zoanthidea from an Edwardsia form is sufficiently obvious.
In the Cerianthidea, as in the Zoanthidea, much as the adult arrangement of mesenteries differs from that of Actinia, the derivation from an Edwardsia stock is obvious.
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