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16 appended to this report. A collection brought by the Mexican Geographical Commission was named for them and will serve as a basis for future study to the conchologists of Mexico. Information or assistance of more or less importance involving the writing of letters to the number of some 350 was furnished by the Department of Mollusks to the following persons among others, often more than once to a single person during the year. Agassiz, Prof. A. Cambridge, Mass. Aldrich, T. H. Cincinnati, Ohio. Beecher, C.E. Albany, New York. Binney, W.G. Burlington, New Jersey. Boury, E. de Vigny, France.