Excerpt from Monograph of the Land and Freshwater Mollusca of the British Isles Internally, the animal displays the same general arrangements of organic structure as the typical Helices, a relationship shown also by the disposition of the retractor muscle of the right tentacle, which passes in its course between the male and female organs, this entanglement being indicative of a funda mental unity of plan, probably dating far back in the history of the group, and differentiating it from the genus Helicella and its allies. Fig. 2. - Terminal portion of the right tentacular retractors in Helix. 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.