. A manual of zoology. Zoology. ?AC> ECmNODERMA. Order III. Clypeastroidea. Irregular flattened ochinoids with central mouth and teeth ; anus out- side the periproct in the posterior iiiterradius, sometimes marginal ; five petaloid ambulaoral areas. Clypeaster (tropical), EahinaradDiius* (sand dollar, flg. 333), Mellita* with holes through the test. Order IV. Spatangoidea. Bilateral flattened forms more or less heart-shaped ; mouth and anus excentric, no teeth; usually five petaloid ambulacral areas and four genital plates. From the forward position of the mouth it follows that only two amb
. A manual of zoology. Zoology. ?AC> ECmNODERMA. Order III. Clypeastroidea. Irregular flattened ochinoids with central mouth and teeth ; anus out- side the periproct in the posterior iiiterradius, sometimes marginal ; five petaloid ambulaoral areas. Clypeaster (tropical), EahinaradDiius* (sand dollar, flg. 333), Mellita* with holes through the test. Order IV. Spatangoidea. Bilateral flattened forms more or less heart-shaped ; mouth and anus excentric, no teeth; usually five petaloid ambulacral areas and four genital plates. From the forward position of the mouth it follows that only two ambulacral areas (bivium, p. ) are upon the lower surface. Warmer seas. Sjiatangris * EcTdnocardiinn, Brissits. Class V. Holothuroidea. The sea cucumbers are most re- Fio. 334. Young Spatangui^ pur- movecl of aiiv STOUT) from the typical ;'MrcH« (after Agassiz), the spines ^ ^ i JX removed oral surface. In front, echinoderm appearance. the slit-like mouth ; taehmd, the , ^. At the first anus. The bivium without tu- glance the skill appears naked and the bercles. " . -^ -^ characteristic plates absent. Yet these are imbedded in the skin in the shape of plates, wheels, and anchors (fig. 335). The integment is tongh, leathery, and muscular with. 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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