Ecological animal geography; an authorized, Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage . ecologicalanimal00hess Year: 1937 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
Ecological animal geography; an authorized, Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage . ecologicalanimal00hess Year: 1937 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. Fig. 19.—Arenicola, from the right: g, gills; Id, dorsal setae; v, ventral setae; e, excretory openings; Ih, head folds; p, papillae on the protruded pharynx. After Ash worth. The number of forms concealed in the sand is astonishingly great. Many sea anemones build tubes in the sand in which they can with- draw completely. Turbellarian and nemertine worms conceal them- selves in the sand from which they may be lured to the surface by
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