Corals and Coral Islands

Actinia afford Agassiz animal Astræa atoll Bank barrier reefs bottom branches budding calcareous calicle Cape cells Chagos Bank channels character coast coral islands coral reefs coral rock corallum Darwin débris deep deposits depth detritus diameter disk east elevation enlarged evidence extent facts fathoms Feejees feet high figure Florida formation fragments fringing reef genus Gilbert Islands Group growing corals growth guano harbor height high islands inch inner reefs islets lagoon land lasso-cells layers lime limestone living corals Madrepores Mæandrina Maldives margin masses miles mouth nearly observed ocean Oculina oölitic outer reef Pacific patches Paumotus Plate polyps Porites Prof Raraka reef-grounds reef-rock region Salomon Islands sand septa shallow shells shore platform side slope sometimes species specimens submerged subsidence surface Tahiti tentacles tion Tongatabu tribe twenty Upolu Verrill volcanic waves Wilkes Wilkes Exploring Expedition yards zoöphytes