A Monograph of West American Melanellid Mollusks
Author : Paul Bartsch
Publisher :
Page : 282 pages
File Size : 17,15 MB
Release : 1917
Category : Eulimidae
ISBN :
Author : Paul Bartsch
Publisher :
Page : 282 pages
File Size : 17,15 MB
Release : 1917
Category : Eulimidae
ISBN :
Author : William Healey Dall
Publisher :
Page : 258 pages
File Size : 41,77 MB
Release : 1909
Category : Pyramidellidae
ISBN :
The Pyramellidae are a family of mollusks mostly of small size and world-wide distribution. No record of unmistakable Pyramidellidae has been found in the Cretaceous faunas, though such may occur, but they are numerous in the Tertiaries and perhaps most fully represented in the existing faunas.
Author : William Healey Dall
Publisher :
Page : 486 pages
File Size : 28,55 MB
Release : 1909
Category : Pyramidellidae
ISBN :
Author : William Healey Dall
Publisher :
Page : 266 pages
File Size : 21,52 MB
Release : 1909
Category :
ISBN :
Author : United States National Museum
Publisher :
Page : 258 pages
File Size : 26,89 MB
Release : 1960
Category :
ISBN :
Author : William Healey Dall
Publisher : Forgotten Books
Page : 336 pages
File Size : 23,43 MB
Release : 2015-07-14
Category : Science
ISBN : 9781331422693
Excerpt from A Monograph of West American Pyramidellid Mollusks In all the species of which the soft parts are known the external anatomy is very similar. In examining a large number of species, as noted by Fischer, intermediate types occur, until it becomes a matter of great difficulty to decide where, if anywhere, the generic lines can be drawn. It is not surprising that some authors have resorted to the expedient of regarding most of the species, notwithstanding the contrasted extremes of the series, as belonging to a single genus. When a group is composed of such a multitude of species, it seems more convenient in practice and leads more efficiently to clear thinking to take the other View, and subdivide the groups sufficiently to make it reasonably clear Where a given species belongs in the series. 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.
Author : Paul Bartsch
Publisher :
Page : 258 pages
File Size : 47,76 MB
Release : 1909
Category :
ISBN :
Author :
Publisher :
Page : 394 pages
File Size : 18,66 MB
Release : 1915
Category : Natural history
ISBN :
Author : Angeline Myra Keen
Publisher : Stanford University Press
Page : 92 pages
File Size : 27,70 MB
Release : 1956
Category : Mollusks
ISBN :
Author : Katherine Van Winkle Palmer
Publisher : Geological Society of America
Page : 420 pages
File Size : 39,77 MB
Release : 1958
Category : Mollusks
ISBN : 0813710766