. Echinoderms of Connecticut . nhr. FIG. 14. Echinarachnius par-ma. Outline of plates on aboral surface; amb, ambulacral areas; inter, interambulacral areas; a, position of intestinal opening. The four genital pores are shown near the center of the disk. In contrast with the large spines of our regular sea-urchins, the disk-urchins are clothed everywhere with minute, slender, brownish or purplish spines, those on the upper surface being cov- ered with cilia, which cause currents of water to pass continually over the respiratory tube-feet. The tube-feet in the clypeastroids are specialized eith
. Echinoderms of Connecticut . nhr. FIG. 14. Echinarachnius par-ma. Outline of plates on aboral surface; amb, ambulacral areas; inter, interambulacral areas; a, position of intestinal opening. The four genital pores are shown near the center of the disk. In contrast with the large spines of our regular sea-urchins, the disk-urchins are clothed everywhere with minute, slender, brownish or purplish spines, those on the upper surface being cov- ered with cilia, which cause currents of water to pass continually over the respiratory tube-feet. The tube-feet in the clypeastroids are specialized either for respiration or locomotion. Those serving the latter function are scattered all over the upper surface in the interambulacral areas as well as in the ordinary position in the ambulacral areas. On the ventral surface they occur along definite grooves in the am- bulacral areas, with branches extending into the interambulacral areas.
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Photo credit: © The Bookworm Collection / Alamy / Afripics
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherhartf, bookyear1912
