EARTH 



SCIENCES 



LIBRARY 



PUBLICATION COMMITTEE 



HENRY SKINNER, M.D., Sc.D. WITHER STONE, A.M., Sc.D. 

 HENRY A. PILSBRY, Sc.D. WILLIAM J. Fox 



MILTON J. GREENMAN, M.D. 



EDITOR : HENRY A. PILSBRY. 

 TREASURER : S. RAYMOND ROBERTS. 



