Manual Of Conchology Vol 23

Author : Henry A. Pilsbry
Publisher :
ISBN 13 : 9781332288670
Total Pages : 322 pages
Book Rating : 4.2/5 (886 download)

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Download or read book Manual of Conchology, Vol. 23 written by Henry A. Pilsbry and published by . This book was released on 2015-08-05 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Manual of Conchology, Vol. 23: Appendix to Amastridae; Tornatellinidae The present volume, mainly concerned with the Family Tornatellinidae, completes a trilogy treating of the snails of Pacific Islands, chiefly of the Hawaiian Islands; the other volumes deal with the Families Amastridae and Achatinellidae. Together with the Partulidae (Volume XX) these are numerically the most important families of the land-snail faunas of the Pacific. They also comprise nearly all of the large laud snails of these faunas. Members of the Superfamily Orthurethra, these primitive land snails, dispersed in the Palaeozoic, parallel the Sigmurethra in their adaptations. There are terrestrial and arboreal types, and cylindric, conic, Bulimoid, Achatinoid and Helicoid shell-forms. This remarkable parallelism has caused the Orthurethrous genera to be scattered, in former classifications, among the series of continental families of the Superfamily Sigmurethra, an arrangement which ignored the structural features of the pallial organs. Of the 219 species and 44 subspecies or named varieties described in this volume, 93 species and 38 subspecies are here defined for the first time. The type-specimens of 168 of the species and subspecies have been examined by one or (usually) both of the authors; also cotypes, paratypes or specimens from the original lots of many other species. Thirty-seven of the species and subspecies herein described have not been seen by either author. Part of these are nominal species, known only by the original descriptions, not subsequently identified by authors or collectors. As half the world separated the authors during the preparation of the manuscript, it was not always possible to collaborate upon every point. The first part of the work, up to p. 68, was therefore chiefly by the senior, the succeeding pages, up to p. 113, mainly by the junior author. In the rest of the book the work is mingled in every genus. 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."