. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage . Fig. 18.—The heart urchin, Echinocardium cordatum, in the sand; the breath- ing and feeding chimney is reinforced by a secretion; the tubular arrangement of the spines and one of the prehensile tube feet are shown. After v. Uexkiill. decapod Albunea (Fig. 21) the two large antennae together form a long tube for the intake of the water for breathing, so that the crab can bury itself in the sand without being cut off from its oxygen supply.

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Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectanimalecology