Excerpt from A Sypsis of the Family Naiades Few branches of Natural History have advanced with more rapidity than that which embraces the part of Malacology which, in this volume, is presented in the form of a Sypsis. This edition is therefore very much enlarged, having quite double the quantity of matter of the former one. The arrangement of the genera will be found td'have been somewhat changed. I have added an extensive alphabetic index of species and synyms, which will be found extremely useful for reference; and the number of. 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 techlogy 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.