.lUN ^0 1693 



$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. PiLSBRT, Conservator Conchological Section, Academy of Natural Sciences, Philadelphi*^ 



ASSOCIATE EDITOR : 

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



Vol. VII. /Zf, JL/ ^. JUNE, 1893. No. 2. 



CONTENTS: 



PAGE. 



Some Notes on Zonitidae. Dr. V. Sterki 13 



A Review of von Ihering's Classification of the Unionid.^ and 



MuTELiD.B. Chas. T. Simpson 17 



The Small Grey Slug in Jamaica. T. D. A. Cockerell 21 



A Reply to Professor Wheeler 22 



American Association of Conchologists 23 



Notes and News 24 



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-OflBce as second-class matter. • 



