Excerpt from An Index to the Genera and Species of the Foraminifera Systematic work on Foraminifera during the past forty years has received a tremendous impulse from their economic value, especially that concerned with the search for petroleum and more recently with ecologic and paleoecologic studies. At present there is a larger number of paleontologists actively engaged in foraminiferal studies than is specializing in any other group of the invertebrates. Because of the daily increasing volume of published material, it is difficult to keep abreast of nomenclatural changes in current work. 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.