$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. JOHNSON, Curator of the Wagner Free Institute of Science. 



Vol. XI. MARCH, 1898. No. 11 



CONTENTS : 



PAGE. 



MOLLUSCA CONTEMPORANEOUS WITH THE MASTODON. By Bryant Walker. 121 

 HAWAIIAN CYPR^ID.. By D. D. Baldwin. ... . 123 



NEW VARIETIES OF UNIONID/E. By Berlin H. Wright. .... 123 



DESCRIPTIONS OF NEW PISIDIA. By Dr. V. Sterki. ... . 124 



PUBLICATIONS RECEIVED. ......... 126 



A CLASSIFIED CATALOGUE OF AMERICAN LAND SHELLS, WITH LOCALITIES. 



(Continued). By Henry A. Pilsbry. . . .127 



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. 



