. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. 290 ECHOs'ODEBMATA. CLASS II—ASTEKOIDEA (STARFISHES).* EcJiinoderms with comjtressed pentagonal or star- slwtped body. The ambulacra! feet are confined to the ventral surface. Internal skeletal pieces in the ambulacra articulated together lil^-, vertebra?. The Star-fishes are chiefly characterised by the predominating pentagonal or star-like discoidal shape of the body, to the ventral. FIG. 235. 'waster srntus, from the oral surface (after A. Agassiz). O, mouth; Af, amb
. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. 290 ECHOs'ODEBMATA. CLASS II—ASTEKOIDEA (STARFISHES).* EcJiinoderms with comjtressed pentagonal or star- slwtped body. The ambulacra! feet are confined to the ventral surface. Internal skeletal pieces in the ambulacra articulated together lil^-, vertebra?. The Star-fishes are chiefly characterised by the predominating pentagonal or star-like discoidal shape of the body, to the ventral. FIG. 235. 'waster srntus, from the oral surface (after A. Agassiz). O, mouth; Af, ambulacra! 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. Those latter consist of transversely arranged, paired calcareous plates (ambulacral ossicles), * J. Muller and Troschel," System der Asteriden," Brunswick, 1841. Com- pare besides the numerous papers of Krohn, Sars, Liitken, L. , 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. London, Swan Sonnenschein & co.
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