THE 



NAUTILUS 



A MONTHLY JOURNAL 



DEVOTED TO THE INTERESTS OF 



CONCHOLOGISTS 



VOL. XXVII. 

 MAY, 1913, to APRIL, 1914. 



EDITORS AND PUBLISHERS : 



A. PILSBRY, Curator of the Department of Mollusca, Academy of Natural Sciences 



PHILADELPHIA. 



<:. W. JOHNSON, Curator of the Boston Society of Natural History, 



BOSTON. 



