On the Classification and Geographical Distribution of Crustacea: From the Report on Crustacea of the United States Exploring Expedition, Under ... During the Years 1838-1842 (Classic Reprint) - Softcover
Inhaltsangabe
Excerpt from On the Classification and Geographical Distribution of Crustacea: From the Report on Crustacea of the United States Exploring Expedition, Under Captain Charles Wilkes, U. S. N., During the Years 1838-1842
This centre, as we have observed in another place, is properly between the second antennae and mandibles. The second antennae and the rudimentary mouth, are among the first parts that appear in the embryo. If we look at it as a centre of force or of growth, we remark that the radii on opposite sides of this centre, before and behind, are very unequal, the latter being six or eight times as long as the former, - a relation which is the. Inverse of the functional importance of the parts pertaining to each.
Our idea of the condition of highest centralization is thus drawn from a study of the species.
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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.
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Excerpt from On the Classification and Geographical Distribution of Crustacea: From the Report on Crustacea of the United States Exploring Expedition, Under Captain Charles Wilkes, U. S. N., During the Years 1838-1842
This centre, as we have observed in another place, is properly between the second antennae and mandibles. The second antennae and the rudimentary mouth, are among the first parts that appear in the embryo. If we look at it as a centre of force or of growth, we remark that the radii on opposite sides of this centre, before and behind, are very unequal, the latter being six or eight times as long as the former, - a relation which is the. Inverse of the functional importance of the parts pertaining to each.
Our idea of the condition of highest centralization is thus drawn from a study of the species.
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.
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Excerpt from On the Classification and Geographical Distribution of Crustacea: From the Report on Crustacea of the United States Exploring Expedition, Under Captain Charles Wilkes, U. S. N., During the Years 1838-1842
The class Crustacea exhibits a clearness of outline in its types, and a display of relations, transitions, and distinctions, among its several groups, exceeding any other department of the animal kingdom. This fact arises from the very great range in structure occupied by the species. The limits in size exceed those of any other class, exclu sive of the Radiata; the length varying from nearly two feet to a small fraction of a line, the largest exceeding the smallest lineally more than a thousand-fold. In the structure of the limbs, the diversity is most surprising, for even the jaws of one division may be the only legs of another; the number of pairs of legs may vary from fifty to one, or none. The antennae may be either simple organs of sense or organs of locomotion and prehension; and the joints of the body may be Widely various in number and form. In the branchial and the internal systems of structure, the' variety is equally remarkable; for there may be large branchiae, or none a. Heart, or none; a system of distinct arterial vessels, or none; a pair of large liver glands, or but rudiments of them; a series of ganglions in the nervous cord, or but one ganglion for the whole body.
Taking even a single natural group, the Decapods; - the abdomen may be very small, Without appendages, and flexed beneath the broad cephalothorax out of view, or it may be far the larger part of the body, and furnished With several pairs of large natatory appendages.
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.
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