Section of a Coral Island.
a, a, Habitable part of the island, consisting of a strip of coral, inclosing the lagoon.
b, b, The lagoon.
The subjoined cut ([fig. 116].) exhibits a small part of the section of a coral island on a larger scale.
Section of part of a Coral Island.
a, b, Habitable part of the island.
b, c, Slope of the side of the island, plunging at an angle of forty-five to the depth of fifteen hundred feet.
c, c, Part of the lagoon.