THE 



NAUTILUS 



A MONTHLY JOURNAL 



DEVOTED TO THE INTERESTS OF 



CONCHOLOGISTS 



VOL. XXI. 

 MAY, 1007, to APRIL, 1OO8. 



EDITORS AND PUBLISHERS : 



H. A. PII.SBRY, Curator of the Department of Mollusca, Academy of Natural Sciences, 



PHILADELPHIA. 



C. W. JOHNSON, Curator of the Boston Society of Natural History, 



BOSTON. 



