. Medusa, Tiaropsis Diadema, after Agassiz. The darkly- shaded organs form the so-called coelenteric apparatus. Of the Echinoderms, the reader is probably ac- quainted, at least with the star-fish (Asterias) and the sea-urchin (Echinus), of which the general form is like- wise usually radiate. Besides a peculiar chalky deposit, or greater or less calcification of the skin covering, a system of water-canals forms a characteristic of this family. With these are connected the rows of suckers, which, by protrusion and retraction, serve as organs of locomotion. On account of the radiate structure p
. Medusa, Tiaropsis Diadema, after Agassiz. The darkly- shaded organs form the so-called coelenteric apparatus. Of the Echinoderms, the reader is probably ac- quainted, at least with the star-fish (Asterias) and the sea-urchin (Echinus), of which the general form is like- wise usually radiate. Besides a peculiar chalky deposit, or greater or less calcification of the skin covering, a system of water-canals forms a characteristic of this family. With these are connected the rows of suckers, which, by protrusion and retraction, serve as organs of locomotion. On account of the radiate structure pre- vailing among the Echinoderms, Medusae, and Polypes,
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