Corals and Coral Islands

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