National Geographic : 1934 Jun
MULTI-HUED MARVELS OF A CORAL REEF NEW GENERATIONS ERECT THEIR CASTLES UPON THE HOMES OF THE OLD The coral tissues are literally immortal unless the entire colony is killed by storm, silting, or prolonged exposure to the air. Each adult polyp splits to form the living bodies of its offspring. Four species are depicted, life size. The rows of slits in the green valleys of a Brain Coral (lower left), are mouths, flanked by other rows of beadlike tentacles winding over the surface. Thriving beside it are a dome-shaped colony of liussa with close-set polyps, clustered doublets of Eusmilia, and starry-eyed soaring Oculina.