Excerpt from Illustrated Catalogue of the Museum of Comparative Zoölogy, at Harvard College, Vol. 7: Revision of the Echini, Parts I-IIOf many of the specimens we have, of course, only the tradition that they are the originals made use of by various authors, this is especially the case with the types of the older authors in the J ardin des Plantes and in the British Museum, but as no one has recently attempted to make direct comparisons of the numerous species described independently, it is not astonishing that when such a comparison is made the number of spe cies distinguished should be found to be so small.To Dr. John E. Gray and the late Dr. Baird of the British Museum I am indebted for giving me every possible facility to examine the collections of the British Museum, containing the types of Dr. Gray's Catalogue of Recent Echini, of his papers in the Proceedings of the Zoological Society of London, in the Annals and Magazine of Natural History, in the Annals of Philosophy, to Dr. P. L. Sclater for his kind assistance in hunting up the types formerly in the collection of the Zoological Society, and to Dr. Charles Stewart for his aid while working in the rooms of the British Museum.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.