Regular Meeting, August 20th, 1866.
Dr. Kellogg in the chair.
Ten members present.
Messrs. W. H. Knight and A. Godefroy were elected Resident Members.
Donations to the Library: Bibliography of North American Conchology previous to the year 1860; by W. G. Binney, Parts 1 and 2, 8vo., Washington, 1864. Cretaceous Reptiles of the United States, by J. Leidy, 4to., Washington, 1866. Palæontology of the Upper Missouri; Invertebrates, by F. B. Meek and F. V. Hayden, Part 1, 4to., Washington, 1865. List of the Coleoptera of North America, by J. L. Leconte, M.D. Part 1, 8vo., Washington, 1863. Researches upon the Hydrobiinæ and allied forms, by Dr. W. Stimpson, 8vo., Washington, 1865. Monograph of American Corbiculadæ, recent and fossil, by Temple Prime, 8vo., Washington. Catalogue of Minerals, with their formulas, etc., by T. Egleston, 8vo., Washington, 1863. Land and Fresh-water Shells of North America, by W. G. Binney, Parts 2 and 3, 8vo., Washington, 1865. Check list of the Invertebrate Fossils of North America; Eocene and Oligocene, by T. A. Conrad; Cretaceous and Jurassic, by F. B. Meek, two 8vo. pamphlets, Washington, 1864-6.
All of the above were published and presented by the Smithsonian Institution.
Prof. W. P. Blake presented the following communication: