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



THE 



NAUTILU 





A MONTHLY *?/f. 



DEVOTED TO THE INTERESTS 

 OF CONCHOLOGISTS. 



EDITOR: 

 H. A. PILSERY, Conservator Conchological Section, Academy of Natural Sciences, Philadelphia. 



ASSOCIATE EDITOR : 

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



Vol. XI. 



MAY, 1897. 



No. 1 



CONTENTS : 



PACK. 



UVANILLA REGINA, A NEW LOCALITY. By Robt. E. C. Stearns. . . 1 

 ON A NEW FORM OF POLYGYRA FROM NEW MEXICO. By W. H. Dall. . 2 

 CONCHOLOGICAL NOTES FROM LOUISIANA. By Lorraine S. Frierson. . 3 

 CONTRIBUTION TO A KNOWLEDGE OF UNITED STATES UNIONID^. By S. 



Hart Wright. . 4 



LIST OF MOLLUSKS COLLECTED IN MALDONADO BAY, URUGUAY, BY DR. 



WM. H. RUSH, U. S. N. By Henry A. Pilsbry. 



ISAAC LEA DEPARTMENT. 



. 6 



. . .9 

 FRESH WATER SHELLS IN THE NORTHEAST OF MAINE. By Olof O. Ny- 



lander. ............ 9 



To SUBSCRIBERS. 12 



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. 



