APR 10 1893 



$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, Philadelphm. 



ASSOCIATE EDITOR : 

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



Vol. VI. APRIL, 1893. No. 12. 



CONTENTS: 



PAGE. 



Illustrations of New Species of Shells I33. 



A New Anodonta. Chas. T. Simpson 134 



The Shell-Bearing Mollusca of Michigan. Bryant Walker 135 



George W. Lichtenthaler. Morton J. Elrod 141 



Notes and Noticed I43. 



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. 



