. Animal activities : a first book in zoölogy. Zoology; Animal behavior. 146 ANIMAL ACTiyiTIES. Summary of Drawings, {a) A living sea-urchin, natural size. (d) A single spine showing mode of attachment to the shell. (c) Several ambulacral and interambulacral plates. (^) External form of a VlG. [8.—The Structure of a Sea-urchin, teeth. A, interior of shell; B, Activities of the Sea-urchin. The activities of the sea-urchin resemble those of the starfish. One pecul- iarity deserves mention. The mouth of the sea-urchin is provided with a complicated arrangement of teeth, five in num
. Animal activities : a first book in zoölogy. Zoology; Animal behavior. 146 ANIMAL ACTiyiTIES. Summary of Drawings, {a) A living sea-urchin, natural size. (d) A single spine showing mode of attachment to the shell. (c) Several ambulacral and interambulacral plates. (^) External form of a VlG. [8.—The Structure of a Sea-urchin, teeth. A, interior of shell; B, Activities of the Sea-urchin. The activities of the sea-urchin resemble those of the starfish. One pecul- iarity deserves mention. The mouth of the sea-urchin is provided with a complicated arrangement of teeth, five in number, uniting at a point. This whole apparatus is called Aristotle's lantern in honor of the philosopher who first de- scribed it. With these teeth and possibly by the aid of oral secre- tions the sea-urchin is enabled to burrow into solid rock. Other Echinoderms. Sea- cucumbers of many kinds, the worm-like S}'napta with i t s anchor-shaped plates, the great variety of starfishes, sand-dol- lars, Crinoids both fossil and present, with other less common forms all bear a striking resemblance to the two forms 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 French, Nathaniel S. (Nathaniel Stowers), 1854-. New York ; London : Longmans, Green, and Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecta, booksubjectzoology
