JUL 2 1890 



$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, Acting Curator Wagner Institute of Science. 



Vol. IV. I2>^ X/Lf JUNE, 1890 No. 2. 



CONTENTS: 



PAGE. 



The Haliotis. Josiah Keep. . . . . . .13 



New Varieties of Patula Strigosa. Henry Hemphill. . . 15 



New Forms of American Pupid/e. Dr. V. Sterki. . . .18 



Distribution of Unionid^ in the Three Rivers, Mahoning, Cuya- 

 hoga, AND Tuscarawas. Geo. W. Dean. . . . .20 



The Shell Bearing Mollusca of Rhode Island. Horace F. Carpenter. 22 

 Publications Received. . . . . . . .23 



General Notes. . . . . . . . .24 



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 Po.st-Office as second-class matter. 



FOREIGN AGENCIES:— London, Trubner & Co., 57 and 59 Ludgate Hill; 

 Berlin, R. Friedlander & Son, 11 Carlstrasse. 



