. Beginners' Zoology . The red corals used for jewelry are bits of stalks of cor-allines. The corallines (Figs. 47, 48) are not so abundant nor so importantas the coral polyps(Figs. 45, 49). Colonies of coralpolyps grow incountless numbersin the tropical coral formedby successive colo-nies of polyps accu-mulates and buildsup many islandsand important addi-tions to continents. The Florida keys, or islands, andthe southern part of the mainland of Florida were Fig. 48. — Organ Pipe Coral (a coralline). POLYPS (.CUPLIKE ANIMALS) 33

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