Manual of Conchology

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Excerpt from Manual of Conchology: Structural and Systematic, With Illustrations of the Species The greater part of this volume is occupied with a review of the family Oleacinidæ. This was undertaken primarily to find place for numerous species described originally as Achatina, Stenogyra, Spiraxis etc., in other systematic works referred mainly to the Achatinidæ or Stenogyridcæ, but now known to belong to the Oleacinidcæ. The work has been extended to supplement the account given in Vol. I of this series, bringing the subject up to date. In order to define clearly the position of the Oleacinidæ in the system of land snails, the foundation of a new classification of the rapacious snails is briefly outlined, and evidence is presented to show the polyphyletic constitution of the so-called "Agnatha, " or "Testacellidæ" of authors. The remainder of the volume treats of the Ferussacidcæ. This family has an extensive literature in four of five languages, the long list of described species is evidence of the tireless industry of erudite conchologists, and yet, we know so little of the creatures themselves that their classification is still purely guess-work. The best-known member of the group, Cochlicopa, is known, by data herein published, to be practically identical with the terrestrial Achatinellidæ. The pallial organs of other genera are unknown, but Ferussacia seems, from the published information, to be an Aulacopod snail. We look to European malacologists, to whom living material is accessible, for information on these little-known snails. The pedal grooves, pallial organs and genitalia of the common genera should be described. In the work on Antillean Oleacinidæ I have had the advantage of using the great collection of C. B. Adams which the authorities of Amherst College with great liberality allowed me to study. 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.