. Animal studies. ECHINODERMS 153 has resulted in the production of a thin, cake-like form (Fig. 94). If the spherical body of a sea-urchin were to be stretched in the direction of a line joining the mouth and the center. Fig. 92.—Basket-star (Astrophytori). One-half natural size. of the dorsal surface, a form resembling a sea-cucumber (Fig. 95) would be the result. These latter organisms live among creyices of the rocks, embedded in the mud or bur- rowing in the sand at the bottom of the sea. In such situa- tions they are well protected, and a highly developed skele- ton, such as that of the
. Animal studies. ECHINODERMS 153 has resulted in the production of a thin, cake-like form (Fig. 94). If the spherical body of a sea-urchin were to be stretched in the direction of a line joining the mouth and the center. Fig. 92.—Basket-star (Astrophytori). One-half natural size. of the dorsal surface, a form resembling a sea-cucumber (Fig. 95) would be the result. These latter organisms live among creyices of the rocks, embedded in the mud or bur- rowing in the sand at the bottom of the sea. In such situa- tions they are well protected, and a highly developed skele- ton, such as that of the sea-urchin, would not only be of little value, but a j)ositive hindrance to locomotion. The skeleton, therefore, is much reduced, consisting of a few scattered calcareous plates embedded in the fleshy body- wall. Another peculiar feature is almost universally pres- ent, in the form of a circlet of tentacles surrounding the mouth, which serve either for the purpose of respiration, for locomotion, or to convey food to the mouth. k very good imitation of the general plan of a sea-lily • or crinoid (Fig. 96) could be made by attaching a serpent-. 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 Jordan, David Starr, 1851-1931; Kellogg, Vernon L. [from old catalog].
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Keywords: ., bookauthorjordanda, bookcentury1900, bookdecade1900, bookyear1903
