PROCEEDINGS 



OF THE 



WASHINGTON ACADEMY OF SCIENCES 



Vol. II, pp. 651-660. December 28, 1900. 



FOSSIL LAND SHELLS OF THE JOHN DAY 



REGION WITH NOTES ON RELATED 



LIVING SPECIES 



By Robert E. C. Stearns. 



[PI.ATE XXXV.] 



The forms described below have previously been made 

 known in Dr. Charles A. White's paper ' On the Marine Eocene, 

 Fresh Water Miocene, and other Fossil Mollusca of Western 

 North America.'^ These forms were submitted to me for de- 

 termination by Dr. White, and my conclusions are embodied in 

 that part of his paper which bears the subtitle ' Fossil Mollusca 

 from the John Day Group in Eastern Oregon.' 



Fifteen years have passed since the publication of Dr. 

 White's paper, and in the meantime the nomenclature has un- 

 dergone so many important changes that a revision of the por- 

 tion with which my name is associated has become necessary. 

 In connection with this revision I have added notes and obser- 

 vations touching the distribution and variation of related living 

 forms which occur in the greater general region wherein the 

 John Day shells were found. 



Before proceeding further with remarks of my own it may 

 be well to quote from Dr. White, as to the character of the 

 locality, and mention the sources from which these fossils were 

 obtained. 



In the year 1883 or about that time. Dr. White received from 

 1 Bulletin U. S. Geological Survey, No. 18, Washington, 1885, pp. 10-19. 



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