EEGs ile 
. Section, natural size. 
PalyAT XX XA, 
EDESTUS MINOR, Newb. (p. 225). 
Doral spine, side view, natural size. 
Coal Measures, Park County, Ind. 
Epestus Hernricusi, N. & W. (p. 225). 
. Doral spine, side view, natural size. 
. Young spine with single denticle. 
. Sheathing segment carrying denticle. 
Coal Measures, Vermillion County, Ind., and Belleville, Ill. 
308 
