LIST OF PUBLICATIONS EXAMINED. 13 
United States Geological Survey: Fifteenth Annual Report and Sixteenth Annual 
Report, Parts II-1V; Bulletins, Nos. 121-126 and 128-129; Geologic Atlas of the 
United States, folios 16-22. Washington, D. C. 
United States National Museum: Bulletin, No. 48; Proceedings, Vol. XVII; Annual 
Report for 1893. Washington, D. C. 
Washington Biological Society : Proceedings, Vol. IX. Washington, D. C. 
Wisconsin Academy of Science, Arts, and Letters: Transactions, Vol. X. Madison, 
Wis. 
Wisconsin, University of: Science Series, Vol. I, Nos. 2-4. Madison, Wis. 
Zeitschrift der dcutschen geologischcn Gesellschaft : Band XL VI, Heft 4, and Band 
XLVII, Hefte 1-2. Berlin, Germany. 
