ADVERTISEMENTS. v 
FOSSILS. 
Cretaceous Invertebrata and 
Tertiary Vertebrata 
Of S. Dakota, Nebraska, and Wyoming, as 
described by Cope, Marsh, Leidy, and Meek. 
Placenticeras, Nautilus, Scaphites, 
Baculites, Teeth and Skulls, Tit- 
| anotherium, Oreodon, Rhinoceros, 
| Anchitherium, Elotherium, Palzo- 
| syops, Dinocerata, Carnivora, etc. 
Hyracodon nebrascensis. 
Green River Fossil Fish ; fifty varieties Fossil Leaves of Dakota Group 
named by Lesquereux. Black Hills Minerals in large variety. /ndian 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. 
Ee Wes tre were 
DEADWOOD, Re SOUTH DAKOTA. 
WANTED. -Back numbers of the 
Naturauist. November 783, April 
and December 85, October, November and 
December 87, all or part of ’77. 
Twenty-five cents will be paid for the 
Index to Vol. XII, which was issued with the 
January number of Vol. XIII. 
Persons having any or all of these for 
sale will please write us, stating price at 
which they hold them. 
FERRIS BROS., Publishers. 
