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9 his entire collection of Mollusca to the Museum, which, when received and arranged, will put the Department of Mollusks in the matter of Naiades, far in advance of any other existing biological museum. The administration on our material is progressing so rapidly that it already exceeds our case room. I shall therefore be obliged to make requisition for some eight new cases with their accompanying drawers etc, to accommodate the general exotic series. The few persons available for work on the collection of Mollusks, recent and fossil, have been engaged with the greatest assiduity