Download or read book A Monograph of the Crag Mollusca Vol 2 written by Searles Valentine Wood and published by Forgotten Books. This book was released on 2018-02-18 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from A Monograph of the Crag Mollusca, Vol. 2: Or Descriptions of Shells From the Middle and Upper Tertiaries of the East O England These marks, therefore, are of essential service to the Palaeontologist, as they afford the only indications of the form possessed by the animal inhabitant, thus im pressed upon the interior of the valves. It is however to be feared, that a perfectly strict reliance cannot always be placed upon the peculiar magnitude of this siphonal scar, even in specific determination, as a marked deviation from what might otherwise be considered its typical form may occasionally be detected, but it is in those species which are most subject to variation in the outward forms of the shell; as a general rule, this line, when visible, is of the greatest assistance, and at all times a good auxiliary character in the determination of a species. The length of the siphonal tubes, or the consequent indenture or sinuation of the mantle mark in the shell, points out a difference in the animal from those in which the sinus is wanting, or at least nearly so, where it indicates a mantle either Without or with very short siphons, giving fair grounds for generic separation; but occasionally, species are met with that are otherwise very closely allied, having a similar dentition, and bear the same general relationship in regard to the shell, although very unlike in the form of the mantle mark, such as Leda and Nucula, Cardium and Addend, Lacz'na and Luciuopsz's, and cannot, without violence to a natural arrangement, be removed to any distant position. 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.
Download or read book A Monograph of the Crag Mollusca Bivalves by S V Wood 1851 61 written by Searles Valentine Wood and published by . This book was released on 1848 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book MONOGRAPH OF THE CRAG MOLLUSCA written by Searles Valentine 1798?-1880 Wood and published by . This book was released on 2016-08-27 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Monograph of the Crag Mollusca Or Descriptions of Shells From the Middle and Upper Tertiaries of the East of England Vol 2 written by Searles V. Wood and published by Forgotten Books. This book was released on 2017-12-19 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from A Monograph of the Crag Mollusca, or Descriptions of Shells From the Middle and Upper Tertiaries of the East of England, Vol. 2: Bivalves The muscular fibres by which the edges of the mantle are withdrawn adhere to, and leave a linear impression somewhat within the margin of the shell; and, in some of the Bivalvia, at the posterior side of the animal, are two siphonal tubes, formed by the prolonged portions of the mantle, the lower one is called the inhalent, the upper one the exhalent siphon, these tubes are capable of being protruded by the animal with the assistance of muscles for that purpose, and again withdrawn under the protection of the shell. In animals possessed of these tubes, the withdrawal of them is indicated in an impression on the body of the shell by the retractor muscle, leaving what is called a siphonal scar, or palleal sinus, which generally denotes, by its depth, a cor responding proportion in the length of the tubes; and where the muscular fibres of the mantle adhere to the interior, leaving the impression without an inflection, the animal either has no prolongation of the mantle, or that the tubes are so short as scarcely to be capable of extension beyond the margin of the valves, and the im pression in that case formed by the mantle is parallel, or nearly so, to the outer edge of the shell. These marks, therefore, are of essential service to the Palaeontologist, as they afford the only indications of the form possessed by the animal inhabitant, thus im pressed upon the interior of the valves. It is however to be feared, that a perfectly strict reliance cannot always be placed upon the peculiar magnitude of this siphonal scar, even in specific determination, as a marked deviation from what might otherwise be considered its typical form may occasionally be detected, but it is in those species which are most subject to variation in the outward forms of the shell; as a general rule, this line, when visible, is of the greatest assistance, and at all times a good auxiliary character in the determination of a species. The length of the siphonal tubes, or the consequent indenture or sinuation of the mantle mark in the shell, points out a difference in the animal from those in which the sinus is wanting, or at least nearly so, where it indicates a mantle either without or with very short siphons, giving fair grounds for generic separation; but occasionally, species are met with that are otherwise very closely allied, having - a similar dentition, and bear the same general relationship in regard to the shell, although very unlike in the form of the mantle mark, such as Leda and Nucula, Cardium and Adama, lucina and Lucifzopsis, and cannot, without violence to a natural arrangement, be removed to any distant position. 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.
Download or read book A Monograph of the Crag Mollusca Or Description of Shells from the Middle and Upper Tertiaries of the Easts of England written by Wood (Searles V.) and published by . This book was released on 1856 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Monograph of the Crag Mollusca written by Searles Valentine Wood and published by . This book was released on 2014 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Monograph of the Crag Mollusca written by HardPress and published by Hardpress Publishing. This book was released on 2013-01 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.
Download or read book A Monograph of the Crag Mollusca written by Searles V. Wood and published by Cambridge University Press. This book was released on 2014-11-20 with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published 1848-82, this multi-part monograph describes and illustrates the fossil molluscs of the Pliocene-Pleistocene Crags of East Anglia.
Download or read book A Monograph of the Crag Mollusca Univalves by S V Wood 1848 written by Searles Valentine Wood and published by . This book was released on 1848 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Monograph of the Crag Mollusca with Descriptions of Shells from the Upper Tertiaries of the British Isles written by Searles Valentine Wood and published by . This book was released on 1850 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Monograph of the Crag Mollusca written by Searles Valentine Wood and published by . This book was released on 1872 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Monograph of the Crag Mollusca written by Searles Valentine Wood and published by . This book was released on 1848 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Monograph of the Crag Mollusca Or Descriptions of Shells from the Middle and Upper Tertiaries of the East of England written by Searles V. Wood and published by . This book was released on 1848 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Monograph of the Crag Mollusca Or Descriptions of Shells from the Middle and Upper Tertiaries of the East of England written by Searles Valentine Wood and published by . This book was released on 1879 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Monograph of the Crag Mollusca Or Description of Shells from the Middle and Upper Tertiaries of the Easts of England written by Wood (Searles V.) and published by . This book was released on 1848 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Monograph of the Crag Mollusca written by Searles V. Wood and published by Cambridge University Press. This book was released on 2014-11-20 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published 1848-82, this multi-part monograph describes and illustrates the fossil molluscs of the Pliocene-Pleistocene Crags of East Anglia.
Download or read book A Monograph of the Crag Mollusca Or Descriptions of Shells from the Middle and Upper Tertiaires of the East of England written by Searles V. Wood and published by . This book was released on 1848 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: