$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. JoHNSOM, Acting Curator Wagner Institute of Science. 



Vol. VI. l^^X)]^ FEBRUARY, 1893. No. 10. 



CONTENTS: 



PAGE. 



Additional Shells from the Coast of Southern Brazil. Wm. H. 



Dall 109 



Description OF A NEW FORM OF Cypr^a. John Ford 112 



The Unio Muddle. Berlin H. Wright 113 



On Clementia Subdiaphana Cpr. in San Pedro Bay. Mrs. Burton 



Williamson 116 



Description OF A new Species OF BuLiMUS. Henry A. Pilsbry. . . . 116 

 Notes on the Helices of the Biologia Centrali-Americana. (Con- 

 tinued.) H. A. Pilsbry 117 



Notes and Notices 118 



Exchanges 120 



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. 



