May 29th; Notes on American Land Shells. No. 6; Descriptions of New Species of Pulmonata in the Collection of the Smithsonian Institution; A List of the Shells of the State of Wisconsin; Contributions to American Lepidopterology: No. 4; Description of a New Species of Marginella; Descriptions of New Organic Remains from the Tertiary, Cretaceous and Jurassic Rocks of Nebraska; Descriptions of Fourteen New Species of Schizostomæ, Anculosæ and Lithasiæ; Catalogue of Birds Collected during a Survey of a Route for a Ship Canal across the Isthmus of Darien, by Order of the Government of the United States, Made by Lieut. N. Michler, of the U. S. Topographical Engineers, with Notes and Descriptions of New Species; Descriptions of Some New Species o