$1,00 per Year, ($1,12 to Foreign Countries,) lOcts.acopy. 



THE 



NAUTILUS 



O ~o5jBs^ v. 

 A MONTHLY 



DEVOTED TO THE INTERESTS 

 OF CONOHOLOGISTS. 



EDITOR 



U.A. PILSBRY, Conservator Conchological Section, Academy of Natural Sciences 



Philadelphia. 



ASSOCIATE EDITOR : 

 C. \V. JOHNSON, Curator of the Wagner Free Institute of Science. 



Vol. XII. MARCH, 1899. No. ii 



CONTENTS: 



PAGE. 

 CATALOGUE OF THE AMNICOLID^: OF THE WESTERN UNITED 



STATES. By Henry A. Pilabry 121 



ON A NEW SPECIES OF DRILLIA FROM CALIFORNIA. By WM. 



H. Ball 127 



NEW PUPID.*:. By Dr. V. Sterki 127 



IN MEMORIAM EDWARD W. ROPER 12!) 



ANOTHER NEW SNAIL FROM NEW MEXICO. By T. D. A. Cock- 



erell 131 



GENERAL NOTES 131 



ISAAC LEA DEPARTMENT 132 



Published by 



H. A. PILSBRY, Editor, Academy of Nat. Sciences, Philadelphia. 

 C. W. JOHNSON, Manager, Wagner Free Institute of Science, Philadelphia. 



Entered at Philadelphia Post-Office as second-class matter. 



