PLATE E. 



Fig. ]. COCCOLITHS 



Fig. 2. RHABDOLITHS .' 



Figs. 3 to 5. EADIOLAKI A. Minnesota and Illinois 



Figs. 6 to 9. RADIOLAKIA. Minnesota and Nebraska 



Figs. 10 to 14, 16. Undetermined 



Fig. 15. Fragment of tooth of flsh [\[ 



Figs. 17 to 22. Sponge spicules. Nebraska ',', 



Figs. 23 to 29. Sponge spicules. Minnesota ". '......... 



Figs. 30 to 32. SPATANGUS (Ecbinoclermata) spicules. Nebraska 



Fig. 33. PuLvraiiLiNA SIENARDII d'Orbigny. Nebraska. Inferior aspect- 

 Fig. 34. PULVINULINA HATJERI d'Orbigny . Minnesota 44 ' 



Figs. 35 and 36. NONIONINA SCAPHA Fichtel and Moll. sp. Calumet, Illinois.'.".'.!! 



Figs. 37 to 39. OPERCULINA COMPLANATA Defrance 



Fig. 38. OPERCULINA COMPLANATA, var. GRANUI.OSA L.-yineri.> 



