. Animal forms; a second book of zoology. Zoology. 144 ANIMAL FORMS star, especially one of the basket-stars, by its dorsal side to a stalk. In the crinoids the numerous branches of the arms are compara- tively short, and in the arrangement of the internal organs there are numer- ous differences, but for all that the re- semblance of these organisms to the other echinoderms is undoubted. 138. Haunts.— The greater num- ber of starfishes occur alongshore, slowly crawling about in search of food, or concealed in dark crevices of the rocks, where they may often be found as the tide goes out, and w
. Animal forms; a second book of zoology. Zoology. 144 ANIMAL FORMS star, especially one of the basket-stars, by its dorsal side to a stalk. In the crinoids the numerous branches of the arms are compara- tively short, and in the arrangement of the internal organs there are numer- ous differences, but for all that the re- semblance of these organisms to the other echinoderms is undoubted. 138. Haunts.— The greater num- ber of starfishes occur alongshore, slowly crawling about in search of food, or concealed in dark crevices of the rocks, where they may often be found as the tide goes out, and we know that in gradually lessening numbers other species lead similar lives at different levels far down in the dark and gloomy depths. In these same locations the sea- urchins occur, sometimes singly, but more usually associa- ted in great numbers, several species excavating hollows in the rocks, within which they obtain protection. The brit- tle-stars and sea-cucumbers may also be found occasionally in open view, but more often they make their way about in search of food buried in the sand. The crinoids are usual- ly inhabitants of deeper water, where they are found asso- ciated often in great numbers. A few species upon attain- ing the adult condition separate from the stalk, and are able to move about (Fig. 95), but the remaining species never shift their Fig. 90.—Sea-urchin {Strongylocentrotus purpuratus). Natural 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; Heath, Harold, 1868- [from old catalog] joint author. New York, D. Appleton and company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
