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Synopsis Molluscorum in Regione Palaearctica Viventium Ex Typo Clausilia Drap (Classic Reprint)

Synopsis Molluscorum in Regione Palaearctica Viventium Ex Typo Clausilia Drap (Classic Reprint)


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About the Book

Excerpt from Synopsis Molluscorum in Regione Palaearctica Viventium Ex Typo Clausilia Drap In der malakologischen Wissenschaft giebt es gewiss kein zugleich schwierigeres und interessanteres Kapitel als das, das die Gattung Clausilia behandelt. Die Schwierig keiten liegen theils in dem ausserst grossen Formenreichthum und doch so scharfen Grenzen der Gattung, dass es erst neuerdings geglückt ist, zwei der vielen Artengruppen als distinkte Genera abzusondern; theils wegen der täuschend ähnlichen Gestalt der Formen und nur im Innern der Schale verborgenen feinen Hauptcharaktere; theils weil viele dieser Charaktere von der höchsten Bedeutung und beständig in gewissen Gruppen sind, aber ohne denselben Werth und veränderlich in anderen; theils weil sowohl der äussere wie der innere Bau ver schiedener Gruppen einen verschiedenen Eindruck von veränderten oder ungleichartigen, geognostischen und physikalischen Einflüssen erfahren. Ohne genaue Kenntniss aller dieser Verhältnisse läuft man stets Gefahr sich zu irren. Noch viele Formen sind, auch die schon längst bekannten, welche den Forschern viel Kopfzerbrechen verursacht haben, wo im System sie ihren rechten Platz haben sollen, als unbeantwortete Fragen übrig. Wo man sie einzu schalten versucht hat, haben sie sich offenbar als Fremdlinge erwiesen, die die Hauptcharak tere der betreffenden Sektionen durch ihre Anwesenheit mehr oder weniger aufgehoben haben. Es verhält sich auch mit vielen dieser Sectionen so, dass sie nicht nur von ihren Polen, sondern von mehreren anderen Stellen Schösslinge in verschiedenen Richtungen gegen andere Sectionen hin ausschiessen, wodurch das System mitunter ein netzförmiges Aussehen bekommt. Dies geht wohl an, insoweit die Frage nur einem ideellen, sogar einem streng natürlichen System gilt, wenn man aber zu gleicher Zeit wünscht, das System praktisch brauchbar zu machen, den Anfängern eine Hülfe, einen Leiter, einen Ariadnefaden in den Labyrinthen zu liefern und doch die natürlichen Verwandten zusammenzuhalten, so wurden die Schwierigkeiten oft derart, dass sich der Satz oft bewahrheitet: Incidit in Scyllam qui vult evitare Charybdim. 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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Product Details
  • ISBN-13: 9780282435240
  • Publisher: Forgotten Books
  • Publisher Imprint: Forgotten Books
  • Height: 229 mm
  • No of Pages: 252
  • Spine Width: 13 mm
  • Width: 152 mm
  • ISBN-10: 0282435247
  • Publisher Date: 13 Sep 2018
  • Binding: Paperback
  • Language: German
  • Returnable: N
  • Weight: 394 gr


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