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Excerpt from Smithsonian Miscellaneous Collections, Vol. 144 Dr. Joseph T. Gregory, while at Yale University, kindly turned over to me for inclusion in this investigation the interesting collection of unstudied materials made near Bitter Creek by O. C. Marsh's par ties. Dr. Peter Robinson supplemented this by sending me from time to time occasional specimens of this collection later encountered during his curatorial work on the Eocene mammals of the Marsh Collection. Dr. Glenn L. Jepsen, in addition to permitting me access to various lower Eocene collections at Princeton University, was most helpful in lending me for review the collections of lower Eocene mammals from the Washakie Basin. The latter were made by Dr. William J'. Morris and included specimens representative of both the Dad and Cathedral Bluffs faunas. Dr. Malcolm C. Mc Kenna, while a student at the University of California, sent me for study a collection of teeth that his party made in beds beneath the Tipton tongue near Dad, during the time of their work at the Four Mile Creek locality in nearby Colorado. I was also permitted, through the kindness of Drs. M. Graham Netting and J. Leroy Kay, to ex amine the Dad locality materials collected by Kay. These were the specimens reported but not seen by me in 19 52. More recently I have been privileged to examine for report several small collections made by Henry W. Roehler of the Mountain Fuel and Supply Co. From a series of carefully documented localities in lower Eocene strata of various horizons on the flanks of the Rock Springs uplift. Dr. Paul O'. Mcgrew of the University of Wyoming has also aided in furnish ing me with selected artiodactyl and primate specimens of particular interest that University of Wyoming parties obtained at various localities in the region. During the fauna] study I have been permitted unrestricted access to the type and other comparative materials in the collections of the American Museum, through the courtesy of Drs. George G. Simpson, Edwin H. Colbert, and Bobb Schaeffer. Mrs. Rachel H. Nichols. 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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