. Text-book of zoology for schools and colleges. Zoology. 92 INYEETEBEATE AiflMALS. consists of alternate homy and calcareous joints. The pol- ypes of all the GorgonidcB agree, of course, with their order in having eight tentacles each, and by this they are distin- guished from the few Zoantharia in which there is a sclero- basic Fig. 29.—Sclerodermic and Sclerobasic Corals, a Portion of broncli of DendrcphyUla n/igresc&ns, a sclerodermic coral (after Dana); & Longitudinal section of Isis Mppwris^ a sclerobasic coral, exhibiting the external bark or ccenosarc, with its imbedded
. Text-book of zoology for schools and colleges. Zoology. 92 INYEETEBEATE AiflMALS. consists of alternate homy and calcareous joints. The pol- ypes of all the GorgonidcB agree, of course, with their order in having eight tentacles each, and by this they are distin- guished from the few Zoantharia in which there is a sclero- basic Fig. 29.—Sclerodermic and Sclerobasic Corals, a Portion of broncli of DendrcphyUla n/igresc&ns, a sclerodermic coral (after Dana); & Longitudinal section of Isis Mppwris^ a sclerobasic coral, exhibiting the external bark or ccenosarc, with its imbedded polypes, supported by the internal axis or skeleton (after Jones). The best known of the GorgonidoB is the Cor allium ruhrum, or " red coral" of commerce, which is largely imported from the Mediterranean. In this species there is a bright-red, finely-grooved, calcareous coral, usually more or less repeatedly branched. The coral is invested by a bright-red ccenosarc or bark, which is studded with numerous little apertures. The polypes can be protruded from these openings at wiU, and are milk-white in color, with eight fringed tentacles each. The entire ccenosarc is excavated into a number of communicating canals, with which the cavities of the polypes are connected, the whole system being filled with a nutritive fluid known as the "; Oedee III. RuGOSA (Lat. rugosus, wrinkled).—This order merely requires mention, as all its members are extinct, and are therefore only known to us by their hard parts or skele-. 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 Nicholson, Henry Alleyne, 1844-1899. New York, D. Appleton and Co.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
