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21 Prof. O.P. Hay, Butler Univ. Irvington Ind. A specimen of [[underlined]]Semotilus bollaris[[/underlined]]. Prof. W.B. Scott, Princeton College, Princeton N.J. Two specimens of [[underlined]]Amia calva[[/underlined]] and two of [[underlined]]Polyodon folium[[/underlined]] for study. F.L. Washburn, for the Museum of Minneapolis, Minnesota. Seven species of marine fishes in exchange. Prof. F.A. Smith, for the Royal Museum of Natural History, Stockholm, Sweden. The following species of