. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . are they out of symmetry and so dif-ferent in outline from the other orders of the class. The am-bulacral zones are in circles, or petaloid in outline, as in cake-urchins, but are not continuous, and the anterior one is usuallyunlike the others and frequently without pores. The entire bodyis covered with spines, and these are the chief organs of locomo-tion ; the greater part of them turn backward, giving the livinganimal the semblance of a porcupine. The mouth is protected by
. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . are they out of symmetry and so dif-ferent in outline from the other orders of the class. The am-bulacral zones are in circles, or petaloid in outline, as in cake-urchins, but are not continuous, and the anterior one is usuallyunlike the others and frequently without pores. The entire bodyis covered with spines, and these are the chief organs of locomo-tion ; the greater part of them turn backward, giving the livinganimal the semblance of a porcupine. The mouth is protected bya projecting plate, but Aristotles lantern is absent in this anatomy is in general the same as in the other orders, butthe organs are turned in conformity with the inclosing of these animals bury themselves in sand or mud and live indeep water; a few only are littoral species. FAMILY : GENUS Moira M. atropos. Size about one inch by one and a half inches, and oneinch thick; color yellowish-white, with brown spines. Found fromNorth Carolina to Florida, from the shore to deep PLATE LVIII. Clypcaster cordifonnis. Mellita trslinlinata. Test of Motalia pectoralis. HEART-URCHINS ±>7 GENUS Lovenia L. cordifbiinis. About one inch, by one and a half inches thick;Ieddish in color; resembles a little porcupine. Found on the southernCalifornia coast. (Plate LVIII.) GENUS Schizaster S. fifif/ilis. One and a half by two inches in size, and one inch thick jcolor brownish. Lives in deep water off the eastern coast. GENUS Metalia M. pectoralis. A very large heart-urchin, found on the southerncoast of Florida and in the West Indies in shallow water. It is, per-haps, the largest species found, being six to eight inches long and pro-portionately wide and thick. The shell is thin, more or less elliptical,and densely clothed with long reddish-gray spines. (Plate LVIII.) GENUS Brissopsis B. Ijififcra. A beautiful deep-wat
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmarinea, bookyear1901
