Excerpt from Contributions to North American Ichthyology Based Primarily on the Collections of the United States National Museum, Vol. 2: A. Notes on Cottidae, Etheostomatidae, Percidae, Centrarchidae, Aphododeridae, Dorysomatidae, and Cyprinidae, With Revisions of the Genera and Descriptions of New or Little Known Species; B. Synopsis of the Siluridae of the Fresh Waters of North America This work is the tenth of a series of papers intended to illustrate the collections of natural history and ethnology belonging to the United States and constituting the National Museum, of which the Smithsonian Institution was placed in charge by the act of Congress of August 10, 1846. It has been prepared at the request of the Institution, and printed by authority of the honorable Secretary of the Interior. Joseph henry, Secretary of the Smithsonian Institution. Smithsonian institution, Washington, May, 187 7. 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.