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TE 
NAUTILUS 
A QUARTERLY JOURNAL 
DEVOTED TO THE INTERESTS 
OF CONCHOLOGISTS 
VOL. XXXIV 
JULY, 1920, to APRIL, 1921 
EDITORS AND PUBLISHERS 
HENRY A. PILSBRY 
Curator of the Department of Mollusca, Academy of Natural Sciences 
PHILADELPHIA 
CHARLES W. JOHNSON 
Curator of thejBoston Society of Natural History 
Boston 
