. Elementary text-book of zoology. Zoology. 290 ECHINODERMATA. CLASS II.—ASTEROIDEA (STARFISHES).* Echinoderms with dorso-ventrally compressed pentagonal or star- s/taped body. Tlie ambulacra! feet are confined to the ventral surface. Internal skeletal pieces in the ambulacra articulated together like vertebra;. The Star-fishes are chiefly characterised by the predominating pentagonal or star-like discoidal shape of the body, to the ventral. FIG. 235. Echtiaffer xenfun, from the oral surface (after A. Agassiz). O, mouth; Af, amtaulacral feet. surface of which the ambulacral feet are confined (
. Elementary text-book of zoology. Zoology. 290 ECHINODERMATA. CLASS II.—ASTEROIDEA (STARFISHES).* Echinoderms with dorso-ventrally compressed pentagonal or star- s/taped body. Tlie ambulacra! feet are confined to the ventral surface. Internal skeletal pieces in the ambulacra articulated together like vertebra;. The Star-fishes are chiefly characterised by the predominating pentagonal or star-like discoidal shape of the body, to the ventral. FIG. 235. Echtiaffer xenfun, from the oral surface (after A. Agassiz). O, mouth; Af, amtaulacral feet. surface of which the ambulacral feet are confined (fig. 235). The radii are long in comparison with the inter-radii, which are very short in consequence of the divergence of the interambulacral rows of plates; they constitute more or less projecting movable arms, with movable skeletal structures. These latter consist of transversely arranged, paired calcareous plates (ambulacral ossicles), * J. Miiller and Troschel. " System cler ; Brunswick, 1841. Com- pare besides the numerous papers of Krohn. Sars. Liitken, L. Agassiz. 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; Sedgwick, Adam, 1854-1913; Sinclair, F. G. (Frederick Granville), b. 1858. New York : Macmillan
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
