. Seaside studies in natural history. Marine animals. HOLOTHURIANS. 95 HOLOTHURIANS. SyWI/pta. {Synapta tenuis Ayres.) This is one of the most curious of the Holothuriaiis, and easily observed on account of its transparency, which allows us to see its internal structure. It has a long cylindrical body (Fig. rur-iat 124) along the length of which run the five rows of ambulacra, which are in this instance closed tubes with- out any projecting suckers or locomotive organs of any kind attached to them, so that the name is retained only on account of their cor- respondence in position, and not from
. Seaside studies in natural history. Marine animals. HOLOTHURIANS. 95 HOLOTHURIANS. SyWI/pta. {Synapta tenuis Ayres.) This is one of the most curious of the Holothuriaiis, and easily observed on account of its transparency, which allows us to see its internal structure. It has a long cylindrical body (Fig. rur-iat 124) along the length of which run the five rows of ambulacra, which are in this instance closed tubes with- out any projecting suckers or locomotive organs of any kind attached to them, so that the name is retained only on account of their cor- respondence in position, and not from any similarity of fdnction to the ambulacra in Star-fishes and Sea-urchins. But though the ambulacra in Synapta are in fact mere water-tubes like the vertical tubes in the Ctenophorse, by means of which the water, first filtered through the madreporic body, circulates along the skin, they are as organs perfectly homologous with the ambulacra in all other Echinoderms. The mouth has a circular tube aroimd the aperture, and a wreath of branching tentacles encircling it. The habits of these animals are singular. They live in very coarse mud^ but they surround themselves with a thin envelope of finer sand, which they form by selecting the Vig. 124. Synapta, natoral Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Agassiz, Elizabeth Cabot Cary, 1822-1907; Agassiz, Alexander, 1835-1910, joint author. Boston, J. R. Osgood and Company
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