251 



Fistulipora iiodulifera. 

 Modiola (?) ? 

 Murcliisonia sp. 

 Platjsomus- sp. 

 Phillipsia- sj). 

 NaiTtiliis occidentalis. 

 Euomplialus (like E. nodosus).^ 

 Euomphalus periiodosus. 

 Macroclieilus- sp. 

 Pleurotomeria^ sp. 



Belleroplion crassus. 

 Dielasma bovidines. 

 Seminula argentia. 



Fistuipora iiodulifera. 

 Modiola sulbelliptica. 

 Murcliisonia sp. 



Phillipsia sp.* 

 Nautilus planovolvis. 

 Enoiiiplialus sp.* 

 Euomplialus periiodosus.* 



Pleurotomeria tabulata. 

 Pleurotoiueria sji. 

 Belleroplion crassus. 

 Dielisma bovidiues. 

 Semiuula argentia. 



Of the 30 genera of the Upper Red Wall tabulated above, 32 are repre- 

 sented in the fossils of the Kansas Coal Measures, and of the 32 species 

 identified 26 are identical. The tabulated comparison, therefore, deter- 

 mines the age of the Upper Red Wall of Arizona to be practically the 

 same as that of the Kansas Coal Measures. 



Note. — The species and genera marked ( ') were taken from Bulletin 211 of the I'. S. 

 tteological Survey. Some of the other Kansas species (not marked) were taken from Dr. 

 Beede's Report, Kansas University Science Bulletin, Vol. I, No. 7, September, 1902. 



