THE 



NAUTILUS 



A MONTHLY JOURNAL 



DEVOTED TO THE INTERESTS OF 



CONCHOLOGISTS 



VOL XXIIL 

 MAY. 1909, to APRIL, 1910. 



EDITORS AND PUBLISHERS : 

 H A. PiLSBRY, Curator of the Dernrtment of MoUusca, Academy of Natural Scicncci, 



PHILADEI-PHIA. 



C. W. Johnson, Curator of the Boston Society of Natural HistoiT, 



Boston. 



