An illustration of coral. Corals are marine organisms from the class Anthozoa and exist as small sea anemone–like polyps, typically in colonies of many identical individuals. The group includes the important reef builders that are found in tropical oceans, which secrete calcium carbonate to form a hard skeleton.
Ed. J.T. Trowbridge, Lucy Larcom, Gail Hamilton Our Young Folks; An illustrated magazine for Boys and Girls (Boston, MA: Ticknor and Fields, 1866)
Courtesy the private collection of Roy Winkelman