ANNUAL REPORTS 
The Academy of Natural Sciences 
OF 
Philadelphia 
FOR YEAR ENDING NOVEMBER 30, 1920. 
Officers and Council 1921 . 
President. 
John Cadwalader. 
Vice Presidents. 
Edwin G. Conklin, Henry Skinner. 
Recording Secretary, Corresponding Secretary. 
James A. G. Rehn, J. Percy Moore. 
Treasurer. 
George Vaux, Jr. 
Librarian. 
Edward J. Nolan.* 
Curators. 
W ither Stone, Spencer Trotter. 
Henry A. Pilsbry, Henry Tucker. 
Additional Members of the Council. 
Class of IQ 2 I. 
Philip P. Calvert, Walter Horstmann. 
Frank J. Keeley, T. Chalkley Palmer. 
Class of IQ22. 
Robert G. LeConte, George L. Harrison, Jr. 
George Spencer Morris, Milton J. Greenman. 
Class of TQ 2 J. 
Charles B. Penrose, William E. Hughes, 
Charles Morris, Roswell C. Williams, Jr. 
*Deceased Jan. 7, 1920. 
