. Animal biology; Human biology. Parts II & III of First course in biology. Biology. ECHINODERMS (SPINY ANIMALS} 39 feet arranged? Where do the rows begin and end? Would you think a sea urchin placed upside down in water, could right itself less or more readily than a star- fish? What advantage in turn- ing would each have that the other would not have? The name sea urchin has no refer- ence to a mischievous boy, but means sea hedgehog (French oursin, hedgehog), the name being suggested by its spines. Comparison of Starfish and Sea Urchin. — The water sys- tem of the sea urchin, consist- i
. Animal biology; Human biology. Parts II & III of First course in biology. Biology. ECHINODERMS (SPINY ANIMALS} 39 feet arranged? Where do the rows begin and end? Would you think a sea urchin placed upside down in water, could right itself less or more readily than a star- fish? What advantage in turn- ing would each have that the other would not have? The name sea urchin has no refer- ence to a mischievous boy, but means sea hedgehog (French oursin, hedgehog), the name being suggested by its spines. Comparison of Starfish and Sea Urchin. — The water sys- tem of the sea urchin, consist- ing of madreporite, tubes, and water bulbs, or ampullae, is similar to that of the FIG. 61. — A SEA URCHIN crawling up the glass front wall of an aquarium (showing mouth spines and tube feet). The tube feet and locomotion are alike. There is no need for well-developed respiratory organs in either animal, as the whole body, inside and out, is bathed in water. The method of repro- duction is the same. The starfish eats soft animal food. The food of the sea urchin is mainly vegetable, and it needs teeth (Fig. 62, 63 ); «-fc,-jKii^'e^ ••=;= •' ..~'-a. 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 Bailey, L. H. (Liberty Hyde), 1858-1954. New York, The Macmillan Co.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiology, bookyear1910
