$1.00 per Year. l0cts. a copy. 
toi 
NAUTILUS 
A MONTHLY 
DEVOTED TO THE INTERESTS 
OF CONCHOEROGISTS. 
ESTABLISHED BY W. D. AVERELL, IN 1886, AS 
“THE CONCHOLOGISTS’ EXCHANGE.” 
Viol, Itt. 
Le, Se, Lk 
7 hie JULY, 1889. No. 3. 
LO, {ETF 
| CONTENTS: 
PAGE. 
NOTE ON TWO HELICES NEW TO THE FAUNA OF THE UNITED STATES. 
Dr. Wm. H. Dall. : : : 
ON A SINGULAR CASE OF IMITATION IN Fog TREA mctareut C. T. Simpson. 26 
LisT OF SHELLS OF THE NEW . COAST SOUTH OF BRIGANTINE ISLAND. 
John Ford. . ; P : ; F : : ‘ Qi 
A MamMotTH LAND SNaIL. R. rE. (Case P : ; rs 2 29 
ON THE GENUS.COROLLA DALL. Dr. Wm. H. Dall. : : ) ; . 80 
THE SHELL-BEARING MOLLUSCA OF RHODE ISLAND. Horace F. Carpenter. 32 
BrigEF NOres ON THE LAND AND FRESH-WATER SHELLS OF MERCER 
County, ILL. William A. Marsh. ‘ , : : ; 2 ot 
GENERAL NOTES. B} 
PUBLICATIONS RECEIVED 
Published by 
H. A. PILSBRY, Editor, Academy of Nat. Sciences, Philadelphia. 
W. D. AVERELL, Manager, Mt. Airy, Philad’a. 
Entered at Philadelphia Post-Office as second-class matter. 
