ADVERTISEMENTS. Y 

FOSSILS. 
Cretaceous Invertebrata and 
Tertiary Vertebrata 
Of S. Dakota, Nebraska, and Wyoming, as 
described by Cope, Marsh, Leidy, and Meek. 
Placenticeras, Nautilus, Scaphites, 
Baculites, Teredo, Turtles, Teeth 
and Skulls of the Titanotherium, 
Oreodon, Mesohippus, Acerathe- 
> rium, Hyracodon, Elotherium, Car- 
1 is has ha bs aie lend SA Gs" 

Green River Fossil Fish; fifty varieties Fossil Leaves of Dakota Group 
named by Lesquereux. Black Hills Minerals in large variety. Jndian Relics 
both ancient and modern. Large stock of everything. Send for illustrated 
catalogue with prices. Wholesale and Retail. Colleges, large collectors, 
amateurs, museums, and dealers supplied. 
LW: SPE WELL, 
DEADWOOD, SOUTH DAKOTA. 
Mention AMERICAN NATURALIST. 
The Ives Strata » Altitude Maps 
OF THE UNITED STATES 
AND PART OF CANADA. 


Descriptive Circular, with Tes- 
timonials from Professors Dana, 
Shaler, Newberry, Cope, Winchell, 
Heilprin, President Gilman, and 
others, together with the inventor's 
“ Guide to Geology by Means of the 
Strata Map,” 

FREE ON APPLICATION TO 
FERRIS BROS., Pustisuers, 
eg | N. E. Cor. 7th and Filbert Streets, 
_ The American Naturalist. : Philadelphia. 




