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7. What material from your department has been transmitted to students and investigators outside of the Museum during the year, and in connection with what special investigation was the material needed?  It should be stated in each case whether or not the material has been returned to the Museum.

Duplicate named specimens were loaned to Mr. H. A. Pilsbry and Mr. B. H. Wright during the year, in connection with their investigations on Deutalium, Bulimulus and Unio, already alluded to. These specimens, in nearly all cases, were returned in a few days after examination. None is at present delinquent.