Branson — The Fauna of the Residuary Auburn Chert. 49 



The following table gives the geological and geo- 

 graphical occurrence of the species that constitute the 

 fauna described in this paper. It is copied with slight 

 modification from Volume III, part II of the Geological 

 Survey of Minnesota. The first five columns give the 

 occurrence of the species in the formations of the Min- 

 nesota region, and the last four columns give their oc- 

 currence in the Cincinnati, Tennessee, New York and Ca- 

 nadian regions. The abbreviations are S, Stones River; 

 B, Black River ; T, Trenton ; U, Utica ; L, Lorraine ; R, 

 Richmond. 



The writer is under obligations to Dr. Stuart Weller, 

 under whose directions these investigations were made, 

 for the privilege of using the material in Walker Museum, 

 for checking up the identifications, and for many valuable 

 suggestions. 



