334 Review of Geinitz on the rocks and fossils of Nebraska. 
Coal-measure strata, we were led to doubt the accuracy of our 
first conclusion. 
copsis 
Pricti, Euomphalus rugosus* (Hall not Sowerby), species of Phil- 
lipsia, and Bellerophon, Petalodus Allegheniensis, and numerous 
others that might be mentioned. These we found often mingled 
in the same beds with the few Permian t es, and in other 1n- 
stances in beds alternating with those containing the latter. 
in the old world, would ever have thought of making any 1 
ortant division here between the Permian and the Coal-meas- 
ge 5 al icin etna 
t will be remembered by those who have read Prof. Mareoas 
paper on the rocks under consideration, (Bull. Soc. Geol. eee 
. aa . 7 I 
Since : between this and Spirorbis planort 
s ~~ Geini tz figures under shia latte hase his Dp, one form with the 
_Guadrangulas fos parently on the left, another with it on the right side, | 
