History of British Mollusca, Vol. 2
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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. 2: And Their Shells The Cockles, properly so called, form a very natural assemblage, presenting well-marked characters both of shell and animal. Their shells are of variable thickness, sometimes strong, in other cases very tender, and are often sculptured in bold and striking relief. The furrows upon them are usually radiating, a feature which prominently distinguishes them from the majority of shells in the last family, and the ridges are often ornamented by arched scales. The dentition of the hinge is very variable, often strongly marked, sometimes nearly obsolete. The pallial sinus is entire, corresponding to the structure of the mantle and siphons, the latter being distinct, but very short, and nearly sessile. Their bases and sides are fringed. The mantle is freely open in front. The foot is remarkable for its geniculated form and great size, enabling the animal to make leaps prodigious in proportion to its dimensions. Isocardia is often included by authors in this family; but, as we have already seen, it has much nearer affinities with Cyprina and its allies. The only British genus truly a member of the group is Cardium; one which, from the number, abundance, and beauty of its species, plays no unimportant part in our marine fauna. 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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