Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 CCELENTERATA 171 SUBCLASS I.—ACTINOZOA (Sea-anemones and Corals). In these the animal is usually fixed. It never swims freely except in the embryonic stages. The body is more or less columnar, with a base for attachment and an oral disc inside the circle of tentacles, in the centre of which is the oval or slit-like mouth. Inside, the septa are well developed, and attached to these are, besides the mesen- terial filaments, long cords of nettle-cells which can be protruded through the mout

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Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 CCELENTERATA 171 SUBCLASS I.—ACTINOZOA (Sea-anemones and Corals). In these the animal is usually fixed. It never swims freely except in the embryonic stages. The body is more or less columnar, with a base for attachment and an oral disc inside the circle of tentacles, in the centre of which is the oval or slit-like mouth. Inside, the septa are well developed, and attached to these are, besides the mesen- terial filaments, long cords of nettle-cells which can be protruded through the mouth or through small openings

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