11 
THE NAUTILUS. 
BACK VOLUMES OF THE NAUTILUS. 
Vol. III. (Nos. 2 and 12 wanting). . $1.00 
Vol. IV. May, 1890 to April, 1891, . 1.00 
Vol. V. May, 1891 to April, 1892, . 1.00 
Vol. VI. May, 1892 to April, 1893, . 1.00 
Vol. VII. May, 1893 to April, 1894, . 1.00 
Of Volume III 20 cents per copy will be paid for Nos. 2 and 12. 
Vols. I and II were known as the “ Conchologist’s Exchange .” We 
can furnish only odd numbers of this. 
AB1TBMTISIK© HA^PBSs 
Advertisements will be inserted at the rate of $1.00 per 
inch for each insertion in advance. Smaller space in propor¬ 
tion. A discount of 25 per cent, will be made on insertions of 
six months or longer. In order to have the paper out promptly, 
“ copy ” is put in the printer’s hands on the 20th of each 
month. 
Address, C. W. JOHNSON, 
Wagner Free Institute, 
Philadelphia, Pa. 
EXCHANGES, 
The following space is to be given to exchanges. Notices not 
exceeding three lines, will be free to subscribers as long as our 
limit of space will allow. 
For Exchange, 3000 species of land and marine shells, including 
rarities in Mitra, Marginella, Aspergillum, Melania, Unio, etc. Wanted: 
Land shells. Miss Linter, Arragon Close, Twickenham, Middlesex, Eng. 
Wanted :—Marine shells from any locality. Offered : — 
Marine, Land and Fresh Water shells. Marine shells mostly from 
Florida. J. J. White, Rockledge Fla. 
Offered— A short list of Maine shells. Desired — Land-shells. 
Rev. Henry W. Winkley, Saco, Maine. 
Wanted: — To Exchange New and Rare species of Alabama 
Land and Fresh water shells for same from other localities. Also 
general list of 600 species. Send lists. 
H. E. Sargent, Woodville, Ala. 
Land and Fresh-Water shells of southern Wisconsin, to exchange 
for the same from other localities ; or for Marine Curios. Send list 
and receive mine. Polished Unios furnished when desired. 
Mrs. E. C. Wiswall, Kenosha. Wis. 
