$1.00 per Year. ($1.12 to Foreion Countries.)  10cts. a copy. 
D J/4Y- gma he 
NAUTILU 
A MONTHLY 
DEVOTED TO THE INTERESTS 
OF CONCHOLOGISTS. 
ESTABLISHED BY W. D. AVERELL, IN 1886, AS 
“THE CONCHOLOGISTS’ EXCHANGE.” 
Vol. III. MARCH, 1890. No. 11. 
CONTENTS: 
PAGE 
On A NEw SPECIES OF TYLODINA. Wm.H. Dall. . ; ‘: : pela 
A NEw AMERICAN BULIMULUS. HL. A. Pilsbry. , Z 3 pe 
ON SOME ae PuPID@, WITH DEsCRIPTIONS OF New SPECIES. 
Dr. V. Sterki. ‘ ; ; : : ; : 2 le: 
ON THE oa POSITION OF ARION Fo. LOLATUS GOULD: ele he cAT 
Cockerell. : 5 ; ; F P A 26 
A Few Last Worps ON CREPIDUL A. John Ford. . : s ‘ . 128 
COLLECTING LAND SHELLS IN EASTERN NEw York. W. S. Teator. li29: 
GENERAL NOTES. F : : ; 5 ; 5 , : . » Laz 
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. 
FOREIGN AGENCIES :—I ondon, Triibner & Co., 57 and 59 Ludgate Hill; 
Berlin, R. Friedlander & Son, 11 Carlstrasse. 
