History of British Mollusca, Vol. 4
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| Partner: | buecher.de |
| Hersteller: | Forgotten Books (Forbes, Edward) |
| Stand: | 2015-08-04 03:50:33 |
Produktbeschreibung
Excerpt from History of British Mollusca, Vol. 4: And Their Shells All the terrestrial, and the majority of freshwater Gasteropodous Mollusca, breathe air, and are provided with a pulmonary cavity, or sac, instead of gills. Over the walls of this sac the blood is distributed in minute vessels, for the purpose of being aerated. The animals presenting this organization, are all provided with distinct heads, furnished with tentacula and organs of sight. They walk by means of a well-developed creeping disk. The majority are protected by shells, but there are some which have no shell, although they do not differ materially in organization or external form. The shells when present are, in the majority of cases, spiral or discoid, and external, in a few instances patelliform; when imbedded in the substance of the mantle, they are unguiform. The embryos have, or have not, shells, according as the adult is to be shell-bearing or naked. Distinct ciliated lobes are not seen upon them, though in the egg they are partially clothed with cilia on the analogous portion of their bodies, and exhibit movements. The number of known Pulmoniferous Mollusks is very great. 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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