Cope.] 



142 



[Dec. 16, 



The accompanying map is intended to illustrate the exact position, as 

 well as the extent of country covered by the Wasatch sediment at this 

 point. Its topography is taken from a map made by Capt. J. Russell, 

 Third Cavalry, U. S. A. (and published by the War Department), during 

 a reconnoissance of that region in the summer of 1880, and to whom, as 

 well as Dr. W. H. Corbusier, Col. J. W. Mason, and other officers sta- 

 tioned at Fort Washakie, I wish to express my deep sense of obligation 

 for their very kind and courteous treatment. 



Map oi tlie .big-Horn basin, reduced Iroiu the Map of the U. S. War Depart- 

 ment. 



2. Synopsis of the Fauna. 



PISCES. 

 Clastes sp. ; not abundant. 

 Pappichthys sp. Vertebrae ; not very common . 



