THE 



NAUTILUS 



A MONTHLY JOURNAL 



DEVOTED TO THE INTERESTS OF 



CONCHOLOGISTS 



VOL. XXVI 

 MAY. 1912, to APRIL, 1913. 



EDITORS AMD PUBLISHERS: 

 1 . A. Pri.'*BRY, Curator of the Department of Mollusca, Academy of Natural Sciences 



Philadelphia. 



c. W. Johnson, Ciirator of the Boston Society of Natural Ilisto- y, 



Boston 



