

si 
a VE, 
ADVERTISEMENTS. v 
FOSSILS. 



| Cretaceous Invertebrata and 
Tertiary Vertebrata 
f 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- 
| 










"Oi 
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. 
L. W. STILWELL, 
DEADWOOD, SOUTH DAKOTA. 
WANTED. — Back numbers of the 
Naturatist. November ‘83, April 
and December 85, October, November and 
December 87, all. or pantof. 37, 
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. 
