THE NAUTILUS. lll 
BXCHANGES. 
Offered.—Unio alatus, Say, plicatus, Leseuer, fragosus, Con., trigonus, Lea; Marg. com- 
planata, Say, and many others, for marine shells. JOSEPH ANDERSON, Box 1955, 
Muskegon, Mich. 
Offered.—Land and Fresh-water Mollusca from North Wtn, U.S. and Cala. for American 
Helices and Pupide. LL.B: ELLIOTT, Box 1532, Iowa City, Iowa, 
FOSSIL FERNS ~ 
From Mazon Creek, Grundy Co., Ills., for sale or exchange for Marine Shells or Corals. 
Only good shells offered or wanted. 
J. C. CARR, Cashier Grun¢y Co. Nat. Bank, 
MORRIS, ILLS. 
Cones’ New Key to North American Birds. 
Revised Edition containing a fullaccountotevery known species, 
8)) pages, o6lillustrations. Boundincloth orflexible leather, $7.00 
Tilustrated prospectus for 4c. postage, I. C Greene, Fitchburg, Mass. 
WEST COAST SHHhrhasS- 
By Progr. Jostau Keep, Mills College, California, 
A familiar description of the Marine, Fresh-Water and 
Land Mollusks, found in the United States, West of the 
Rocky Mountains. 182 Illustrations, 230 pages. The 
frontispiece is a hand-painted engraving of the very rare 
S and beautiful Swrcula Carpenteriana, Gabb. 
“M\ Vo aid in the study of Shells, the pronunciation of the 
Latin names is indicated, anda Glossary, Key, Biographi- 
cal Index of Naturalists, and a Check List are added. 
Beautifully printed and bound, Price, postpaid, $1.75. 
Helix (Aglaia) fidelis, Gray, Oregon. C. 1. DILLINGHAN, 718 Broadway, New York City. 
Please mention this paper. 
ee WV ES A DE Ric AN SCLaN Tis Tt 
Will hereafter be published by the undersigned. Mr. CHARLES R. ORCUTT of San Diego 
will continue as its editor. 
First issued as a four-page monthly in 1884, this magazine has steadily grown in merit and 
popular favor until it is now in the forefront of the scientific magazines of the country. 
SAMUEL CARSON & CO. 
Publishers, Booksellers and Stationers, Wholesale and Retail, 
208 Post St., San Francisco. 
THE OBSHRVER: 
A monthly journal especially for 
Soe NS AND LONE OP oN AT UR Bb: 
With miscellaneous reading of value and interest to all. Has departments of Botany, Zoology, 
Astronomy, Geology, Ornithology, Entomology, Microscopy, etc., each department being in 
charge of a specialist. : ; 
#i@s-Do you love the great out-door world, do you enjoy roaming over fields and through the 
woods, are you interested in the birds, flowers, insects, rocks, etc., do you wish to know more 
of the wonders and beauties of nature? Have yov a microscope or wish to get one, or are you 
interested in chemical or physical experiments? Do you enjoy good, interesting miscellaneous 
reading? Ifso, then subscribe for Ze Observer. oe 
It is an unique, original paper. ‘‘ Keep Your Eyes Open,”’ is its motto. : 4 
There is no other paper of the same character published. ‘‘ It supplies a need’’ is the 
unanimous verdict. Subscription only 50 cents a year. Send for sample copy. 
Address: ETLWARD F. BIGELOW, Portland, Conn. 
Se Ci A by NOLL C He 
In order to increase the growing circulation of THe Nauricus in Foreign Countries, a limited 
number of copies will be sent to resident students in Exchange for desirable named shells. 
Address, THE NAUTILUS, Mt. Airy, Philadelphia, Pa. 
