THE 



NAUTILUS 



A MONTHLY JOURNAL 



DEVOTED TO THE INTERESTS OF 



CONCHOLOGISTS 



VOL. XXX 

 MAY, 1916, to APRIL, 1917 



EDITORS AND PUBLISHERS 



HENRY A. PILSBRY 



Curator of the Department of Mollusca, Academy ot Natural Sciences 



PHILADELPHIA 



CHARLES W. JOHNSON 



Curator of the Boston Society of Natural History 

 BOSTON 



