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Excerpt from General Evolutionary Patterns and the System of the Class Bivalvia Food gathering by means of the labial palps restricted the radiation of the Protobranchia. Most members of this superorder (order Nuculida) preserved features characteristic of mobile Bivalvia-an oval or anterior - posteriorly lengthened shell, a mobile foot with a flat sole, 2 adductor muscles, a nuculoid hinge con sisting of chevron-shaped teeth which grow in size in front of and behind the umbo, and primitive double ctenidia with lamellae directed centrally from the axis. The labial palps-the main food gathering organ - and the ligament primarily undergo changes. 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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