Office of the U. S. Geological Exploration 



OF THE Fortieth Parallel, 



NoAV York, April, 1877. 

 General: Herewith I have the honor to transmit Vohnne IV of the 

 Reports of this Exploration, composed of Memoirs on Paleontology, by 

 Messrs. F. B. Meek, James Hall and R. P. Whitfield; also on Ornithology, 

 by Robert Ridgway. 



Very respectfully, your obedient servant, 



CLARENCE KING, 



Geolofjist-hi-charge. 

 Brig. Gen. A. A. Humphreys, 



Chief of Engineers U. S. Army, 



Washington, D. 0. 



