Bancroft Library 



DEPARTMENT OF THE INTERIOR, 



UNITED STATES GEOLOGICAL SURVEY, 



Washington, D. C., June 1, 1884 



SIK: Herewith I have the honor to transmit a report on the inverte- 

 brate fossils of the Paleozoic rocks of the Eureka District, Nevada. 



I am greatly indebted to you for the personal interest you have taken 

 in the work and generous facilities given me, both in the field and office, in 

 carrying on the earlier part of this investigation. 



I am also under many obligations to Hon. J. W. Powell, Director of 

 the Geological Survey, for the opportunity afforded me to continue and 

 enlarge the work after the completion of the original report. 

 Very respectfully, 



CHARLES D. WALCOTT. 

 Mr. ARNOLD HAGUE, 



Geologist in Charge. 



