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necessary to the studies involved, and not yet contained in the Museum Library.  Several costly and important works have already been ordered or received under this assignment, and more will follow.  Our sincere thanks are due to Mr. and Mrs. Chamberlain for their wise and considerate generosity, which not only benefits science and the Museum, but continues the association of the name of Lea with progress in the study of these groups of animals, in a graceful and most gratifying way.

On completion of an exchange sometime since entered into, Mr. Maurice Cossmann of Paris, the successor of Deshayes in the