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activity adult animal anus appear arms arrangement associated attached base become Biology body burrow calcite called canal cells coelenterates coelom connective tissue continuity covering crystal derms direction drawn early echino echinoderms effector elements entirely epithelial epithelium example extended external feed fibres five fluid function further glandular pedicellaria groups head inside integrative internal jaws known later Left living madreporite material mechanical motor mouth move muscles needs nerve normal occur operation organs origin pass pattern pedicellariae perhaps phase phylum physiological places plates plexus pluteus poison position possible pressure probably Protective radial Radial nerve radii radius Reader response ring round Schematic diagram sea-urchin sea-water sensory shown skeletal skeleton spaces spines stage starfish stem stimulus structures struts substances supply surface sutures symmetry taking tissues tube tube-feet tube-foot unique urchin usually valves wall water-vascular system