Excerpt from Summary of the Marine Shellbearing Mollusks of the Northwest Coast of America: From San Diego, California, to the Polar Sea, Mostly Contained in the Collection of the United States National Museum, With Illustrations of Hitherto Unfigured Species Since that time a constant inflow of material from that region has enriched the collection of the United States National Museum until it has become unrivaled in this group of animals. Very few of the species described from the area between the southern boundary of the United States and the Polar Sea on the Pacific coast are absent from the series referred to. In a few cases where the writer has not been able to verify personally the names or the distribution from authentic specimens, the name of the authority upon whom the data rest has been added in parentheses. The distribution of the Mollusca on the west coast of America may be allotted to three grand divisions: the Arctic or Boreal, the Tem perate, and the Tropical faunas. The first, containing many Circumboreal species, extends from the Arctic or Polar Sea to the southern limit of drift ice in winter in Bering Sea. The Temperate division extends from this line southward on the west coast of America to Point Conception, California. The Tropic division extends from this point southward to Point Aguja on the coast of Peru. 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.