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Excerpt from Memoirs Read Before the Boston Society of Natural History, Vol. 1: Being a New Series of the Boston Journal of Natural History The class of Polyps has undergone many changes, as it has been found necessary, from time to time, to remove groups belonging to other classes, confounded with it so long as their structure was imperfectly understood. The true polyps were for the first time divided into the two natural orders characterized by the number and structure of the tentacles, by milne-edwards and Audouin, in 1828, but at that time no special names were applied to the two groups thus established. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.