. Corals and coral islands. Coral reefs and islands; Corals. CORALS AND CORAL MAKERS. 6i In one family of this tribe the polyps form red calcareous tubes; sometimes a slender, creeping tube, with polyps at intervals, as in a species referred by the author to the genus Aulopora ; but generally vertical tubes, grouped into large red masses, called, popularly, Orga?i- pipe coraL A portion of one of the latter—Tiibi- pora syringa D.—is re- presented in the first of the annexed figures, with its expanded polyps; and a polyp from the group much enlarged in the sfcond figure. The papillse of the frin
. Corals and coral islands. Coral reefs and islands; Corals. CORALS AND CORAL MAKERS. 6i In one family of this tribe the polyps form red calcareous tubes; sometimes a slender, creeping tube, with polyps at intervals, as in a species referred by the author to the genus Aulopora ; but generally vertical tubes, grouped into large red masses, called, popularly, Orga?i- pipe coraL A portion of one of the latter—Tiibi- pora syringa D.—is re- presented in the first of the annexed figures, with its expanded polyps; and a polyp from the group much enlarged in the sfcond figure. The papillse of the fringe are arranged closely together in a plane, so that it is not at first apparent that there is a fringe. The third figure represents, enlarged, the polyp of another Feejee species, the Tubipora fiinbriata I). Such coral masses are sometimes a foot or more in diameter, and the living zoophyte, with its lilac or purple polyps fully expanded, looks much like a large cluster of flowers from a lilac bush, plates at intervals. 2. Gorgo/iia tribe, or Gorgonacea.—The following figure re- presents a species of this tribe from the Kingsmill or Gilbert Islands. It is one of the net-like or reticulated species, the. The tubes are united by cross. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Dana, James Dwight, 1813-1895. London : Sampson Low, Marston, Low and Searle
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