Author: B B Woodward

Publisher: Forgotten Books

Published: 2018-02-23

Total Pages: 646

ISBN-13: 9780332165783

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Excerpt from Proceedings of the Malacological Society of London, Vol. 14: 1920 1921 Evidence OF the size - The Helicidae, however, are also without peripodial grooves. But in this family the dorsal wall of the duct of the pedal gland is longitudinally folded,2 Which is not the case in Acantkinula, Vallom'a, or Pyramidala. Moreover, the very small size Of these snails at least suggests that they may not be rightly assigned to the Helicidae. It is true that the Rev. E. W. Bowell has expressed the Opinion that size has counted for too much in our systems Of classification But he goes on to point out that an increase or diminution Of size in an organism necessitates a re distribution Of symmetry, because the constituent cells do not change their size proportionately, and that this rearrangement Often involves a considerable morphological change. It would therefore seem improbable that a very great alteration'in size could be easily and quickly efiected in the course of evolution; and, if this be the case, the species of Vallom'a and Acantkmula are not likely to be very closely related to Helix pomatia and its allies. 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 Proceedings of the Malacological Society of London, Vol. 14 written by B B Woodward and published by Forgotten Books. This book was released on 2018-02-23 with total page 646 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Proceedings of the Malacological Society of London, Vol. 14: 1920 1921 Evidence OF the size - The Helicidae, however, are also without peripodial grooves. But in this family the dorsal wall of the duct of the pedal gland is longitudinally folded,2 Which is not the case in Acantkinula, Vallom'a, or Pyramidala. Moreover, the very small size Of these snails at least suggests that they may not be rightly assigned to the Helicidae. It is true that the Rev. E. W. Bowell has expressed the Opinion that size has counted for too much in our systems Of classification But he goes on to point out that an increase or diminution Of size in an organism necessitates a re distribution Of symmetry, because the constituent cells do not change their size proportionately, and that this rearrangement Often involves a considerable morphological change. It would therefore seem improbable that a very great alteration'in size could be easily and quickly efiected in the course of evolution; and, if this be the case, the species of Vallom'a and Acantkmula are not likely to be very closely related to Helix pomatia and its allies. 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.