Regular Meeting, May 6th, 1867.
President in the Chair.
Thirty-two members present.
Messrs. F. F. Thomas, Silas A. White, B. Smith, M. J. McDonald, Wm. Patten and Philip Prior, were elected Resident Members, and Dr. C. L. Anderson, of Santa Cruz, Cal., Henry Walter Bates, Assistant Secretary Royal Geographical Society of London, Prof. J. H. Balfour, of Edinburgh University, Dr. John Alexander Smith, F.R.S., of Edinburgh, James Haswell, M.A., of the Geological Society of Edinburgh, Capt. J. B. Caldbeck, F.R.G.S., of Singapore, and Sir Roderick I. Murchison, President of the Royal Geographical Society of London, were elected Corresponding Members.
Donations to the Library: Gold and Silver Tables, by L. Garnett; Catalogue of Casts of Fossils for sale by Prof. H. A. Ward, of Rochester University.
The Committee on Field Meetings reported on that of April 20th, near the Twelve-Mile House. Specimens of the fossils collected at the locality visited were exhibited by Mr. Yale, and remarks were made on the position and age of the strata there exposed, by Prof. Whitney, Dr. Cooper and Mr. Stearns. Mr. Lorquin mentioned the species of birds seen and collected during the excursion.
Mr. Stearns presented, in behalf of Mr. Rowell, the following description of a new species of Pisidium, collected during the field excursion to Angel Island: