Beginners' zoology . 32 BEGINNERS ZOOLOGY coating has apertures through which the polyps pro-trude in order to feed when no danger is near (Fig. 46).. Fig. 46. — Red Coral-line with crust .nndpolyps {eight tentacles).

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1921