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Excerpt from Carpoid Echinoderms From the Silurian and Devonian of Australia The carpoids embrace some of the most enigmatic organisms that have lived on earth. Among the echinoderms they constitute an assemblage of archaic departures from the better known routes of evolution and before their extinction in the Middle Paleozoic demonstrated an amazing diversity of organizational plans. Their rarity as fossils has undoubtedly militated against the recognition and acceptance of their higher categorical Signifi cance in echinoderm classification. Yet when confronted by a demonstrably unique and basically new scheme of organization, even though a paucity of material is at hand, there is much to be said for pointing up the evolu tionary import of the novelty by creating the taxonomic structure seemingly required. 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.