Elementary text-book of zoology, general part and special part: protozoa to insecta . elementarytextbo00clau Year: 1892 290 i:CHI>'ODEBMATA. CLASS II.—ASTEROIDEA (STARFISHES).* Echinoderms vnth dorso-ventrcdly compressed 2^e'>^tf'i/onal or star- shaped body. TJie amhxdacral feet are confined to the ventral surface. Internal skeletal 2'>i^ces in the amhidacra articulated together like 'vertehrcB. The Star-fishes are chiefly characterised hj the predominating pentagonal or star-like discoidal shape of the body, to the ventral Fig. 233. EcTiinasfo- seiifiis, from the oral surface (af
Elementary text-book of zoology, general part and special part: protozoa to insecta . elementarytextbo00clau Year: 1892 290 i:CHI>'ODEBMATA. CLASS II.—ASTEROIDEA (STARFISHES).* Echinoderms vnth dorso-ventrcdly compressed 2^e'>^tf'i/onal or star- shaped body. TJie amhxdacral feet are confined to the ventral surface. Internal skeletal 2'>i^ces in the amhidacra articulated together like 'vertehrcB. The Star-fishes are chiefly characterised hj the predominating pentagonal or star-like discoidal shape of the body, to the ventral Fig. 233. EcTiinasfo- seiifiis, from the oral surface (after A. Agai?si7,). ' 0, mouth; Af, ambulacral feet. surface of which the ambulacral feet are confined (fig. 235), The radii are long in compai-ison 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 airanged, paired calcareous plates (ambulacral ossicles), * 'J, Miiller and Troschel,'• System cler-Asteriden,' Brunswick, 1841. Com- pare besides the nnmcrons papers of Krohn, Sars, Llitken, L. Agnssiz, etc.
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