JUN 8 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. PiLSBRT, Conservator Conchological Section, Academy of Natural Sciences, Philadelphia. 



ASSOCIATE EDITOR : 

 C. W. Johnson, Curator of the Wagner Free Institute of Science. 



Vol. VII. /£j^ ^//y^ MAY, 1893. No. 1. 



CONTENTS: 



PAGE. 



Illustrations of New Shells 1 



South American Notes. Dr. Wm. H. Rush, U. S. N 2 



CoNULUS FULVUS MuLL. Var. dentatus, n. V. Dr. V. Sterki .... 4 



POLYGYRA SUBPALLIATA, N. SP, H. A. Pilsbry 5 



Dall's Tertiary Mollusks of Florida 7 



Cesare Maria Tapparone Canefri 8 



The Unio Muddle. Prof. Chas. Le Roy Wheeler 9 



Notes and News 10 



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. 



