A Zoological Pocket book Or Synopsis of Animal Classification Comprising Defi
A Zoological Pocket book Or Synopsis of Animal Classification Comprising Defi
Emil Selenka
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Sexes generally separated. A crown of hollow tentacles sur- rounds the elongated mouth. Usually with a firm calcareous non- superficial skeleton, and frequently colonial by budding. For the most part inhabitants of shallow water (coral reefs). Order 1. Rugosa (Tetracoralla). Palaeozoic (except Holocystis) corals, with numerous tetramerously grouped septa. Cyathophyllum. Order 2. Alcyonaria (Octactinia, Octocoralla), with eight pinnate tentacles, and as many uncalcified mesenteric folds with ven...tral retractor muscles. Calcareous spicules usually present in the mesoglcea. Alcyonium digitatum, dead man's fingers, stocks of fleshy polypes. Pennatula rubra and Veretillum, sea-pens, stocks, of which the naked basis sticks in the mud, horny axial skeleton ; the latter dioecious. Gorgonia ; Corallium rubrum, red coral. Tubipora purpurea, organ- pipe coral. Heliopora, massive skeleton, dimorphic polypes. , : Order 3. Zoantharia (Hexactinia, Hexacoralla). The number of the non-pinnate tentacles, and mesenteric pouches, six, or a multiple thereof.
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