$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, Acting Curator Wagner Institute of Science. 



Vol. VI. AUGUST, 1892. No. 4. 



CONTENTS: 



PAGE. 



Collecting Notes. Chas. T. Simpson 37 



On Atlantic Crepidulas. Witmer Stone 40 



The Shell Bearing Mollusca of Michigan. Bryant Walker 4U 



Gould's Types of Nassa and Columbella. W. B. Marshall 47 



General Notes 48 



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. 



