160 
IOWA ACADEMY OF SCIENCES 
Barnes, W. D. ; Reppert, Fred ; and Miller, A. A. Proceedings of the Daven- 
port Academy of Sciences, Vol. 8, p. 260, 1900. 
Shimek, B. Iowa Geological Survey, Vol. 10, p. 177, 1900. 
Gow, James E. Proceedings of the Iowa Academy of Sciences, 1900, Vol. 
8, p. 159, 1901. 
Cratty, R. I. Proceedings of the Iowa Academy of Sciences, 1906, Vol. 11, 
p. 216, 1904. 
Mueller, II. A. Proceedings of the Iowa Academy of Sciences, 1903, Vol. 11, 
p. 277, 1904. 
I'eck, Morton E. Proceedings of the Iowa Academy of Sciences, 1904, p. 204, 
1905. 
