. Corals and coral islands. Coral reefs and islands; Corals. BLOCKS OF CORAL ROCK ON THE SHORE PLATFORM. two it is usually cemented together into a more or less com- pact coral sand-rock. One singular feature of the shore platform, occasionally ob- served, remains to be mentioned. Huge masses of reef rock are sometimes found upon it, some of which lie loose upon the reef, while others are firmly imbedded in it below, and so cemented to it as to appear to be actually a part of the plat- form rock. Sketches of two of these masses are given above. Figure i represents a mass on the island of Water

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. Corals and coral islands. Coral reefs and islands; Corals. BLOCKS OF CORAL ROCK ON THE SHORE PLATFORM. two it is usually cemented together into a more or less com- pact coral sand-rock. One singular feature of the shore platform, occasionally ob- served, remains to be mentioned. Huge masses of reef rock are sometimes found upon it, some of which lie loose upon the reef, while others are firmly imbedded in it below, and so cemented to it as to appear to be actually a part of the plat- form rock. Sketches of two of these masses are given above. Figure i represents a mass on the island of Waterland (one of the Paumotus), six feet high and about five in dia- meter; it was solid with the reef-rock below, as though a part of it; and, about two feet above its base it had been so nearly worn off by the waters as to have become irregularly top- i, . Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Dana, James Dwight, 1813-1895. London : Sampson Low, Marston, Low and Searle