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Excerpt from Manual of Conchology, Vol. 9: Structural and Systematic, With Illustrations of the Species; (Helicid , Vol; 7.) Guide to the Study of Helices The group of Pulmonate genera familiarly known as Helices, forms an important factor in the land mollusk fauna of every coun try, in point of numbers exceeding any other group of snails. This numerical and faunal pre-e'minence has caused the authors of the manual to devote eight volumes to Helicoid genera, the earlier three (vol. II to IV) being prepared by Mr. Tryon, the later vol umes by the writer. During the progress of the work it became obvious that the established system of grouping required revision, not alone in the details of many minor divisions, but in those broader principles underlying our conceptions of the entire classification and genealogy of the group. The object of this volume is to formulate in compact form the new classification of Helices, and incidentally to indicate some general principles upon which a new grouping of all land pul monates must be based. 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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