Excerpt from A Monograph of the Existing Crinoids, Vol. 1: The Comatulids 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 Maria metrida, with the exception of the family Colobometridae. Part 4b, the present part, is a continuation of Part 4a and contains the account of the family Colobometridae of the superfamily Mariametrida, and of the families Tr0piometridae, Calometridae, Ptilometridae, and Asterometridae of the superfamily Tropiometrida. 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.