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



ASSOCIATE EDITOR : 

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



Vol. XI. 



NOVEMBER, 1897. 



No. 7 



CONTENTS : 



PAGE. 



NEW SPECIES OF MEXICAN LAND SHELLS. By W. H. Ball. . . 73 



DESCRIPTION OF A NEW VARIETY OF LAND SHELL FROM IDAHO. 



By Henry Hemphill. 74 



NOTES ON SLUGS. By T. D. A. Cockerell. . . 75 



ISAAC LEA DEPARTMENT. ... . . .80 



NOTES AND NEWS 81 



A CLASSIFIED CATALOGUE OF AMERICAN LAND SHELLS, WITH LOCALITIES. 



(Continued). By Henry A. Pilsbry. . . .83 



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. 



