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Excerpt from A Monograph of the Existing Crinoids, Vol. 1 Parts 3, 4, and 5 of Volume 1, Bulletin 82, include the systematic discussion of the species and higher groups of living comatulids, or unstalked crinoids. Part 3, published on March 21, 1931, included the account of the superfamily Comasterida. Part 4a, published on August 5, 1941, included the account of the superfamily Mariametrida, With the exception of the family Colobometridae. Part 4b, published on October 9, 1947, contained the account of the family Colobometridae of the superfamily Maria metrida, and of the families Tropiometridae, Calometridae, Ptilometridae, and Aster ometridae of the superfamily Tropiometrida. Part 40, the present one, is the concluding section of part 4. It is a continuation of Part 4b and includes the account of the two remaining families of the Tropiometrida, the Thalassometridae and the Charitomet ridae. Part 5, the concluding part of Volume 1, will be an account of the entire sub order Macrophreata. 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.

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