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



THE 



«:Jf^- 



NAUTILUS 



A MONTHLY 

 DEVOTED TO THE INTERESTS 

 11^^1'i 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. JANUARY, 1893. No. 9. 



CONTENTS: 



PAGE. 



Catalogue of the Genus Partula. W. D. Hartman, M. D 97 



BiFIDARIA : A NEW SUBGENUS OF PuPA. By Dr. V. Sterki 99 



Shells of William's Canon, Colorado. By F. A. Sampson 102 



Post Pliocene Shells. O. A. Crandall 103 



On Acanthopleura and its Subgenera. H. A. Pilsbry 104 



A New Trochid from Japan. H. A. Pilsbry 105 



Notes and News 106 



Exchanges 108 



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. 



