CHAPTER XVII. COELENTERATA. POLYPS AND JELLY-FISHES. |
| Thread-cells or Urticating Organs.—SertulariÆ.—CampanulariadÆ.—Hydrozoic AcalephÆ.—MedusidÆ.—LucernariadÆ.—CalycophoridÆ.—The Velella.—The Portuguese Man-of-war.—Anecdote of a Prussian Sailor.—Alternating Fixed and Free-swimming Generations of Hydrozoa.—Actinozoa.—Ctenophora.—Their Beautiful Construction.—Sea-anemones.—Dead Man's Toes.—Sea-pens.—Sea-rods.—Red Coral.—Coral Fishery.—Isis hippuris.—Tropical Lithophytes.—History of the Coral Islands.—Darwin's Theory of their Formation.—The progress of their Growth above the level of the Sea | 345 |
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