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17. 

Mr. W. L. Williamson, in exchange for American species. 

In addition to this number, a great many accessions which have not been specified, contain interesting and diserable material which is much appreciated. 

The Department of Agriculture and United States Fish Commission have contributed several small lots of mollusks of more or less interest, but no very large contributions of material have been received from government sources during the past year. 

Assistance to Students. 
The work of assisting students in various parts of the country to identify their shell faunas, to direct their studies, and to answer their numerous questions on different branches of the subject, has always been regarded as