. Animal activities; a first book in zoo?logy. Zoology; Animal behavior. Pig. 118.—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 int
. Animal activities; a first book in zoo?logy. Zoology; Animal behavior. Pig. 118.—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 Synapta 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 Fig. 119.—A Sea-cucum- 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 Stowers, 1854-. New York [etc. etc. ] Longmans, Green and Co
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