■81 



THE 



NAUTILUS 



A QUARTERLY JOURNAL 



DEVOTED TO THE INTERESTS 



OF CONCHOLOGISTS 



VOL. XXXI 

 JULY, 1917, to APRIL, 1918 



EDITORS AND PUBLISHERS 



HENRY A. PILSBRY 



Curator of the Department of MoUusca, Academy o( Natural Sciences 

 Philadelphia 



CHARLES W. JOHNSON 



Curator of the Boston Society of Natural Hiatoiy 

 Boston 



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