. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. CBINOIDEA. 287 attaclied by its dorsal apex. The segments of the stalk, which are mostly pentagonal, are connected by bands of tissue, and are pierced by a central canal, which serves for nutrition, and contains a central a:id five peripheral blood vessels; at certain distances they bear hollow and segmented cirri, which are arranged in whorls. The dorsal surface of the calyx is covered externally by regularly arranged calcareous plates, while the upper (ventral) surface, on which the mouth and anus
. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. CBINOIDEA. 287 attaclied by its dorsal apex. The segments of the stalk, which are mostly pentagonal, are connected by bands of tissue, and are pierced by a central canal, which serves for nutrition, and contains a central a:id five peripheral blood vessels; at certain distances they bear hollow and segmented cirri, which are arranged in whorls. The dorsal surface of the calyx is covered externally by regularly arranged calcareous plates, while the upper (ventral) surface, on which the mouth and anus are situate, is clothed with a leathery. Fig. 232 —Comatida mediterraiiea represented from the ventral side. O, mouth ; A, anus. The pinnulse are filled with the generative products. skin. At the margin of the cup there arise movable, simple or forked, and often branched arms, which are su2:)p3rted by a solid framework con-isting of dorsally placed calcareous plates, which are movable upon one another by special muscles. In almost Arch, fiir Naturgesch, 1851, , "On the Embryology of the Antedon rosaceus," Phil. Trans. Roj. Soc, Tom , 18G5. W. B. Carpenter, "Researches on the Structure, Physiology and Development of Antedon rosaceus," Hid., Tom A. Gotte, " Vergl. Eatwickelungsgeschichte der Gumatula Mediterranea," Archiv. fiir miekrosh. Anatomie, Tom XII. H Ludwig, " Merphol. Studien an Echinodermen," Leipzig, 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 Claus, Carl, 1835-1899; Metcalf Collection (North Carolina State University). NCRS. London, Swan Sonnenschein
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanimals, bookyear1892
