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THE 
NAUTILUS 
A MONTHLY 
DEVOTED TO THE INTERESTS 
OF CONCHOLOGISTS. 
ESTABLISHED BY W. D. AVERELL, IN 1886, AS 
“HH CONCHOLOGISTS? EXCHANGE.” 
Wolk Tit. JUNE, 1889. No. 2. 
CONTENTS: 
PAGE. 
Notes oN LOPHOCARDIUM. Wm. H. Dall. ‘ ‘ : . ; gs 
A NEw CALIFORNIAN HELIx. H. A. Pilsbry. : ; . : . 14 
Unio COMPLANATUS IN MICHIGAN. Bryant Walker. : ; : eG 
DescrRIPTION OF HELIx DENTONI. John Ford. . 5 : : ; ey 
DISTRIBUTION OF HELICINA OCCULTA Say. C. R. Keyes. i : > Js 
THE SHELL-BEARING MoLLUSCA OF RHODE ISLAND. Horace F. Carpenter. 21 
SHELLS OF MERCER Co., ILL. Wm. A. Marsh. . ; : : : 23 
GENERAL NOTES. : F ; ; é 5 5 ; : : 79 
PROCEEDINGS OF SCIENTIFIC SOCIETIES. : : : ; : : 20 
PUBLICATIONS RECEIVED. : : . ; : : ‘ : aye 
ADVERTISEMENTS, ae ‘ ; ‘ : ; ; : ii, ill, iv. 
PHILADELPHIA : 
Published by H. A. PILSBRY and W. D. AVERELL. 
Entered at Philadelphia Post-Office as second-class matter. 
