. A textbook in general zoology. Zoology. 96 STARFISH, SEA UKCHIN, BRITTLE STARS luoutli. On rc'iuox'inti; the .spines ami .skin, a beautiful globular shell (Fig. 49) is exposeil, within wliich are the organs of the body. The .shell is composed of limestone plates which fit very together and are ornamented on the surface, with rounded protuberances, for the articula- tion of the spines. The plates composing the shell are grouped together in such a manner that the}' form ten dis-. FiG. 4S. — Sea urchin, showing spines on outside of sheli. tinct zones. Five of these zones bear tube feet
. A textbook in general zoology. Zoology. 96 STARFISH, SEA UKCHIN, BRITTLE STARS luoutli. On rc'iuox'inti; the .spines ami .skin, a beautiful globular shell (Fig. 49) is exposeil, within wliich are the organs of the body. The .shell is composed of limestone plates which fit very together and are ornamented on the surface, with rounded protuberances, for the articula- tion of the spines. The plates composing the shell are grouped together in such a manner that the}' form ten dis-. FiG. 4S. — Sea urchin, showing spines on outside of sheli. tinct zones. Five of these zones bear tube feet and five bear none, and each zone alternates with the otlicr. There- fore, although the sea urchin does not possess five distinct arms bearing tube feet, yet the shell presents five distinct areas bearing tube feet, which is comparable witli the structure of the starfish. The sea urchin possesses five long, curved teeth which lie mostly ^^dthin the body, only the points 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 Herrick, Glenn W. (Glenn Washington), 1870-1965. New York, Cincinnati [etc. ] American Book Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
