TIVE 
NAUTILUS 
A QUARTERLY JOURNAL 
DEVOTED TO THE INTERESTS 
OF CONCHOLOGISTS 
VOL. XXXTII 
JULY, 1919, to APRIL, 1920 
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B i 
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EDITORS AND PUBLISHERS 
HENRY A. PILSBRY 
Curator of the Department of Mollusca, Academy of Natural Sciences 
PHILADELPHIA 
CHARLES W. JOHNSON 
Curator of the Boston Society of Natural History 
Boston 
