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Excerpt from Palaeontographica Americana, 1974-1978, Vol. 8 I am greatly indebted to the authorities of the Natur historisches Museum Basel for the use of all working facili ties and for providing funds to visit museums and institutes in Geneva, Paris, London, Amsterdam, Leiden, and Brus sels. Practically all photographs were taken by Mr. W. Suter, photographer at the Naturhistorisches Museum Basel, for whose thorough work I am very grateful. I am also obliged to Mr. O. Garraux, Basel, for the fine drawings of specimens. 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.