THE 



NAUTILUS 



A MONTHLY JOURNAL 



DEVOTED TO THE INTERESTS OF 



CON.CHOLOGISTS. 



VOL. V. 

 MAY 1891 to APRIL 1892. 



I'lIILADELPIIIA 

 Published by H. A. PILSBRY and C. W. JOHNSON. ^ 





^uV,4 



