11 THE NAUTILUS. 



BACK VOLUMES OF THE NAUTILUS. 



Vol. IV. May, 1890 to April, 1891, . $1.00 

 Vol. V. May, 1891 to April, 1892, . 100 

 Vol. VI. May, 1892 to April, 1893, . 1.00 

 Vol. VII. May, 1893 to April, 1894, . 100 

 Vol. VIII. May, 1894 to April, 1895. . 1.00 

 Vol. IX. May, 1895 to April, 1896. . 1.00 

 Vol. X. May, 1896 to April, 1897. . 1.00 

 Of Vols. I and II, which were known as the " Conchologist'a Ex- 

 change," and Vol. Ill of THE NAUTILUS, we can furnish odd 

 numbers only. 



Extras of August and September number, (1895) containing an 

 Index to the Concholo gists' Exchange for binding with the latter, 

 will be furnished at 10 cents per copy. 



Advertisements will be inserted at the rate of $1.OO 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 2Oth 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 : Helix latiaxis, Linterce, Taylorlana ; also large 

 collection of land and marine (many rare). Desiderata new or 

 rare Helices. Miss LINTER, 



Arragon Close, Twickenham Middlesex, England. 

 FOR EXCHANGE: Land, fresh water and marine shells, (many 

 rare species offered) for species not in my collection. List first. 



C. F. ANCEY, administrates- adjoint, Dra-el Mizan, Algeria. 

 WANTED : North American Limnceidce in sets from various local- 

 ities. OFFERED : Marine shells from Florida and land and fresh 

 water shells from Chicago. FRANK C. BAKER, 



Academy of Sciences, Lincoln Park, Chicago, 111. 

 OFFERED : Land, fresh-water and marine shells, many desir- 

 able species. Also a few Couchological books. 



A. A. HINKLEY, Du Bois, 111. 



FOR EXCHANGE: Austrian shells; also various marine, land 

 and fresh water shells, for species not in ray collection. List first. 



A. OBERWIMMER, Med. Ill, Haupt St. 97, Vienna, Austria. 

 OFFERED : Fine sets of Wis. Unios, natural or polished, together 

 with pearls with each, all correctly identified and desirable for 

 scientific collections and museums. 



MRS. E. C. WISWALL, 408 Park St., Kenosha, Wis. 



