$1.00 per Year. ($1.12 to Foreign Countries.) lOcts. a copy. 



THE 



NAUTILUS 



A MONTHLY 



DEVOTED TO THE INTERESTS 

 OF CONCHOLOGISTS. 



EDITOR: 

 H. A . PILSERY, Conservator Conchological Section, Academy of Natural Sciences, Philadelphia. 



ASSOCIATE EDITOR : 

 C. W. JOHNSON, Curator of the Wagner Free Institute of Science. 



Vol. XII. 



OCTOBER, 1898. 



No. 6 



CONTENTS : 



WILLIAM HENRY DECAMP. By Bryant Walker. . 



A DAY ON THE CHICAGO DRAINAGE CANAL. By Frank C. Baker. . 



A NEW SPH^RIUM.. By F. C. Baker 



DESCRIPTION OF A NEW SPECIES OF OLIVELLA. By John Ford. 



AN INTERROGATION IN REGARD TO SEPTIFER BIFURCATUS RVE. , AND 



MYTILUS BIFURCATUS CONR. By Mrs. M. Bui ton Williamson. 

 NOTE ON SEPTIFER BIFURCATUS CONRAD. By H. A. Pilsbry and W. J. 



Raymoml. ........... 



NOTES AND NEWS .... 



NEW PUBLICATIONS RECEIVED. 



PAGE. 

 . 61 

 . 63 

 . 65 

 66 



67 



69 

 71 

 72 



Published by 



H. A. PILSBRY, Editor, Academy of Nat. Sciences, Philadelphia. 



C. W. JOHNSON, Manager, Wagner Free Institute of Science, Philad'a. 



Entered at Philadelphia Post-Office as second-class matter. 



