$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. PILSBRV, Conservator Conchological Section, Academy of Natural Sciences, Philadelphia. 



ASSOCIATE EDITOR : 

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



Vol. XI. 



DECEMBER, 1897. 



No. 8 



CONTENTS : 



NEW WEST AMERICAN SHELLS. By W. H. Dall. 

 NOTE ON Two SPECIES OF HELICINA. By C. F. Ancey. 

 OXYCHONA UNMASKED. By H. A. Pilsbry. 

 ISAAC LEA DEPARTMENT. 



NOTES AND NEWS 



A NEW PLICATE UNIO. By Berlin H. Wright. 

 POLYGYRA FERRISSI n. sp. By H. A. Pilsbry. 



PAGE. 

 . 85 

 . 87 

 . 87 

 . 89 

 . 90 

 . 91 

 92 



A CLASSIFIED CATALOGUE OF AMERICAN LAND SHELLS, WITH LOCALITIES. 

 (Continued). By Henry A. Pilsbry. . 



93 



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. 



