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Journal of researches into the natural history and geology of the countries visited during the voyage of H.M.S. "Beagle" round the world, under the command of Capt. Fitz Roy, R.N.

.'AA outer edges of the barrier—reef at the level of the sea, with islets on it. B'B', The shores of the included island. CC, The lagoon—channel. A''A'', Outer edges of the reef, now converted into an atoll. C', The lagoon of the new atoll. NB.According to the true scale, the depths of the lagoon—channel and lagoon are much exaggerated

Black and white drawing of transection of island progression of barrier reefs and lagoon channels

.'AA outer edges of the barrier—reef at the level of the sea, with islets on it. B'B', The shores of the included island. CC, The lagoon—channel. A''A'', Outer edges of the reef, now converted into an atoll. C', The lagoon of the new atoll. NB.According to the true scale, the depths of the lagoon—channel and lagoon are much exaggerated.