$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. 



JUNE, 1897. 



No. 2 



CONTENTS : 



PAGE. 



HELICINA DYSONI. By Charles T. Simpson. . . .13 



DESCRIPTION OF A NEW SPECIES OF ACTAEON FROM THE QUARTERNARY 



BLUFFS OF SPANISH BIGHT, SAN DIEGO, CALIFORNIA. By Robert E. 



C. Stearns. ........... 14 



NOTES ON AGRIOLIMAX. By T. D. A. Cockerell. ... .15 



DESCRIPTION OF THREE NEW EULOT/E (HELICES) FROM CENTRAL ASIA. 



By C. F. Ancey. . . 16 



NOTES ON THE CLASSIFICATION OF THE UNIOS. By Chas. T. Simpson. . 18 

 ISAAC LEA DEPARTMENT. . 23 



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. 



