I. Fossil vertebrates. pt. I. Contributions to the extinct vertebrate fauna of the western territories, by J. Leidy. 1873.--II. The Vertebrata of the Cretaceous formations of the West, by E.D. Cope. 1875.--III. The Vertebrata of the Tertiary formations of the West. book I. By E.D. Cope. 1883.--V. Zoology and botany. pt. I. Synopsis of the Acridiad of North America, by C. Thomas. 1873.--VI. Contributions to the fossil flora of the western territories. pt. I. The Cretaceous flora, by L. Lesquereux. 1874.--VII. Contributions to the fossil flora of the western territories. pt. II. The Tertiary flora, by L. Lesquereux. 1878.--VIII. Contributions to the fossil flora of the western territories. pt. III. The Cretaceous and Tertiary floras, by L. Lesquereux. 1883.--IX. A report on the invertebrate Cretaceous and Tertiary fossils of the upper Missouri county, by F.B. Meek. 1876.--X. A monograph of the geometrid moths or Phalnid of the United States, by A.S. Packard, Jr. 1876.--XI. Monographs of North American Rodentia, by E. Coues and J.A. Allen. 1877.--XII. Fresh-water rhizopods of North America, by J. Leidy. 1879.--XIII. The Tertiary insects of North America, by S.H. Scudder. 1890