

AUTHOR'S EDITION. 



DEPARTMEi^T OF THE INTERIOR. 



UNITED STATES GEOLOGICAL AND GEOGRAPHICAL SURVEY. 

 F. V. HAYDEN, U. S. Geologist-in-Charge. 



OSTEOLOG.Y 



NORTH AMERICAN TETRAONIDiE, 



Dr. R. W. SHUFELDT, U S. A. 



EXTRACTED FROM THE BULLETIN OF THE SURVEY, Vol. VI, No. 2. 



Washington, September 19, 1881. 



