Excerpt from Report of the Canadian Arctic Expedition, 1913-18, Vol. 7: Crustacea; Part L: Parasitic Copepoda While the parasitic Copepods collected by Mr. Frits Johansen during the Canadian Arctic Expedition do not include any forms new to science, they are still of peculiar scientific interest for two reasons. The first of these has already been stated in connection with both the fresh-water copepods and the free swimming marine forms, namely the fact that they were collected in a region hitherto practically unexplored for such crustaceans. The present author has reported a few species collected 'by Alaskan and Siberian fishermen and presented to the United States National Museum; but they were nearly all marine forms and included only a few straggling specimens from the Salmonidae that spawn in fresh water. The present collection supplements these in a very decisive manner and indicates that the genus Salmincola is as well represented in the polar as in temperate regions. In fact we are now justified in concluding that these crustacean parasites are as widely distributed as their fish hosts, and wherever the hosts are found we may well expect to discover also the Copepods which infest them. 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.