Abstract
The holothurians of the order Elasipoda have few and usually large tube feet. The tube feet are not connected with normal water-vascular ampullae but communicate with large water- vascular cavities in the skin. Walking specimens of Elasipoda of the genus Scotoplanes show a number of constrictions of the body wall. The constrictions are interpreted as peristaltic movements by means of which fluid is pressed from the dermal cavities into the tube feet. The replacement of the ampullae by dermal cavities made possible the application of the muscles of the body wall in the protraction of the oversize tube feet of the Elasipoda.
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