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



THE 



NAUTILUS 



A MONTHLY 



I a cj lU DEVOTED TO THE INTERESTS 



' OF CONCHOLOGISTS. 



EDITOR: 

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



ASSOCIATE EDITOR : 

 C. W. Johnson, Acting Curator Wagner Institute of Science. 



Vol. VI. OCTOBER, 1892. No. 6. 



CONTENTS: 



PAGE. 



On the Amnicoloid Genus Lyogyrus, with the Description of a New 



Species. Henry A. Pilsbiy 61 



A Few Additional Notes on Crepidula. Rev. Henry W. Winkley. 63 



The Shell Bearing Mollusca of Michigan. Bryant Walker. . . . 6S 

 Observations on the Helicoid Group Charopa and Allied Forms. 



Henry A. Pilsbry 67 



Japanese Limpets. Geo. W. Taylor 69 



American Association of Conchologists 70 



Notes and News 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. 



