. Beginners' Zoology . — A Sea-urchinwith spines removed,the limy plates showingthe knobs on which thespines Fig. 63.—Section of Sea-urchinwith soft parts removed, showing thejaws which bear the teeth protrudingin Fig. 62. its food tube is longer than that of a starfish, just as the food tubeof a sheep, whose food digests slowly, is much longer than that ofa dog. 40 BEGINNERS ZOOLOGY

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