Download book Memoirs of the Museum of Comparative Zoology, at Harvard College, Vol. 22 (Classic Reprint)
Download book Memoirs of the Museum of Comparative Zoology, at Harvard College, Vol. 22 (Classic Reprint)
Memoirs of the Museum of Comparative Zoology, at Harvard College, Vol. 22 (Classic Reprint).cUnknown Author
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Author: Unknown Author
Page Count: 628 pages
Published Date: 27 Sep 2015
Publisher: Forgotten Books
Publication Country: United States
Language: English
ISBN: 9781332196968
File Name: Memoirs.of.the.Museum.of.Comparative.Zoology,.at.Harvard.College,.Vol..22.(Classic.Reprint).pdf
Download Link: Memoirs of the Museum of Comparative Zoology, at Harvard College, Vol. 22 (Classic Reprint)
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Excerpt from Memoirs of the Museum of Comparative Zoology, at Harvard College, Vol. 22 Our purpose has been to present in Oceanic Ichthyology a discussion of all forms of fishes found in the seas of the world, both pelagic species and those occurring at depths greater than 500 feet, especial prominence being given to those species which are found in the Atlantic Ocean, most of which we have had opportunity to study. All oceanic fishes are included, partly because it is not yet possible to distinguish strictly between the two classes, and partly because the pelagic forms have, in part at least, been mentioned in the discussions by all previous writers on "deep-sea fishes." By Oceanic fishes we mean those deep sea and pelagic species which dwell in the open ocean far from the shore, either at the surface, at the bottom, beyond a depth of 500 feet, or, if such fishes there be, the intermediate zones. Oceanic Ichthyology is that branch of ichthyology which is concerned with their study. Deep-sea fishes are those which are found at a depth of 1,000 feet or more, without reference to the question whether or not they also occur in shallower water. The limit of 500 feet is taken for convenience in the study of the origin of local deep-sea faunas. The limit of 100 fathoms is that ordinarily in use. The Reports of the Challenger class as "deep-sea deposits" all those below 100 fathoms depth. The zone between the litteral zone, and the bathybial zones, 500-1000 feet, is called the "hemibathybial zone" Pelagic fishes are those which live far from land and at a distance from the bottom, rarely approaching the shore except when driven by wind or current. It is these which are most closely associated with the "Plankton," and were included in it before the meaning of the term, as proposed by Hensen, was limited by Haeckel. Some of these, which occur at considerable depths, we call "bathypelagic." We cannot claim that in the present memoir we have brought forward any conclusions which are new to science, though a great number of new facts are recorded. We hope, however, that we have succeeded in the attempt to bring the information which we have ourselves been able to obtain into proper relationship with the mass of similar knowledge already recorded, and that our descriptions are so accurate and full that the deterioration or loss of the material studied, much of which was in very fragmentary and precarious condition when it came to us, may not be entirely disastrous. We have tried to assemble all existing data about oceanic fishes and to arrange them in such a manner that they may be serviceable to naturalists in other fields for comparison and study, as well as to ichthyologists for ready reference, when at a distance from the rather extensive group of books which must now be consulted even for the casual identification of a deep-sea fish. We have also endeavored to sum up the conclusions reached by previous students before incorporating our own results with those of our predecessors. 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."
Read online Memoirs of the Museum of Comparative Zoology, at Harvard College, Vol. 22 (Classic Reprint) Buy Memoirs of the Museum of Comparative Zoology, at Harvard College, Vol. 22 (Classic Reprint) Download and read Memoirs of the Museum of Comparative Zoology, at Harvard College, Vol. 22 (Classic Reprint) for pc, mac, kindle, readers Download to iPad/iPhone/iOS, B&N nook Memoirs of the Museum of Comparative Zoology, at Harvard College, Vol. 22 (Classic Reprint)
Memoirs of the Museum of Comparative Zoology, at Harvard College, Vol. 22 (Classic Reprint).cUnknown Author
Author: Unknown Author
Page Count: 628 pages
Published Date: 27 Sep 2015
Publisher: Forgotten Books
Publication Country: United States
Language: English
ISBN: 9781332196968
File Name: Memoirs.of.the.Museum.of.Comparative.Zoology,.at.Harvard.College,.Vol..22.(Classic.Reprint).pdf
Download Link: Memoirs of the Museum of Comparative Zoology, at Harvard College, Vol. 22 (Classic Reprint)
---------------------------------------------------------------
Excerpt from Memoirs of the Museum of Comparative Zoology, at Harvard College, Vol. 22 Our purpose has been to present in Oceanic Ichthyology a discussion of all forms of fishes found in the seas of the world, both pelagic species and those occurring at depths greater than 500 feet, especial prominence being given to those species which are found in the Atlantic Ocean, most of which we have had opportunity to study. All oceanic fishes are included, partly because it is not yet possible to distinguish strictly between the two classes, and partly because the pelagic forms have, in part at least, been mentioned in the discussions by all previous writers on "deep-sea fishes." By Oceanic fishes we mean those deep sea and pelagic species which dwell in the open ocean far from the shore, either at the surface, at the bottom, beyond a depth of 500 feet, or, if such fishes there be, the intermediate zones. Oceanic Ichthyology is that branch of ichthyology which is concerned with their study. Deep-sea fishes are those which are found at a depth of 1,000 feet or more, without reference to the question whether or not they also occur in shallower water. The limit of 500 feet is taken for convenience in the study of the origin of local deep-sea faunas. The limit of 100 fathoms is that ordinarily in use. The Reports of the Challenger class as "deep-sea deposits" all those below 100 fathoms depth. The zone between the litteral zone, and the bathybial zones, 500-1000 feet, is called the "hemibathybial zone" Pelagic fishes are those which live far from land and at a distance from the bottom, rarely approaching the shore except when driven by wind or current. It is these which are most closely associated with the "Plankton," and were included in it before the meaning of the term, as proposed by Hensen, was limited by Haeckel. Some of these, which occur at considerable depths, we call "bathypelagic." We cannot claim that in the present memoir we have brought forward any conclusions which are new to science, though a great number of new facts are recorded. We hope, however, that we have succeeded in the attempt to bring the information which we have ourselves been able to obtain into proper relationship with the mass of similar knowledge already recorded, and that our descriptions are so accurate and full that the deterioration or loss of the material studied, much of which was in very fragmentary and precarious condition when it came to us, may not be entirely disastrous. We have tried to assemble all existing data about oceanic fishes and to arrange them in such a manner that they may be serviceable to naturalists in other fields for comparison and study, as well as to ichthyologists for ready reference, when at a distance from the rather extensive group of books which must now be consulted even for the casual identification of a deep-sea fish. We have also endeavored to sum up the conclusions reached by previous students before incorporating our own results with those of our predecessors. 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."
Read online Memoirs of the Museum of Comparative Zoology, at Harvard College, Vol. 22 (Classic Reprint) Buy Memoirs of the Museum of Comparative Zoology, at Harvard College, Vol. 22 (Classic Reprint) Download and read Memoirs of the Museum of Comparative Zoology, at Harvard College, Vol. 22 (Classic Reprint) for pc, mac, kindle, readers Download to iPad/iPhone/iOS, B&N nook Memoirs of the Museum of Comparative Zoology, at Harvard College, Vol. 22 (Classic Reprint)