IX.—The development of the sea-anemonesMetridium dianthus(Ellis) andAdamsia palliata(Bohad)

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Abstract
MetridiumandAdamsiaare genera of the Family Sagartiadæ, Sub-Order Malacactineæ, Order Actiniidæ, Sub-Class Zoantharia. The Malacactinese (or “True” Sea-Anemones) with the Scleractineæ (or “True” Corals) make up the Order Actiniidæ. In this Order there is an eight-mesenteried Edwardsia stage, and thereafter a primary cycle of six couples of mesenteries is (or may be inferred to be) completed by the addition of two pairs to the eight Edwardsia mesenteries, while succeeding cycles are formed in the exocoeles of the pre-existing mesenterial cycles. Other so-called sea-anemones are the Zoanthidæ and Cerianthidea, but, from the arrangement of their mesenteries, they have to be classed as separate Orders, though in all of them the primary Edwardsia mesenteries can be recognised during development or in the adult condition. The remaining Zoantharian Order, the Antipathidæ, is somewhat aberrant. Their development is unknown, but it is stated that one species,Leiopathes glaberrima, shows distinct indications of an Edwardsia stage.

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