PLATE LXXIV. 



PAGE. 



Fig. 1. STENOPORA AMERICANA Ulr 437 



1. Tangential section, x!8, showing extremes of wall thickness. 



1 a. Peripheral portion of a vertical section, x!8, showing moniliform char- 



acter of walls. To the left a. wall from another section. 

 Keoknk group, Warsaw, 111. 

 Illinois State Museum. 



Fig. 2. STENOPOKA EMACIATA Ulr 438 



2. Tangential section, x!8, showing extremes in thickness of walls and size 



of zooecia. 



2 a. Vertical section, x!8, showing faintly moniliform character of walls. 



Keokuk group, Warsaw, 111. 

 E. O. Ulrieh's collection. 



Fig. 3. STENOPOKA AMEKICANA var. VARSOVIENSIS Ulr 437 



3. Peripheral portion of a vertical section, x!8. showing irregular structure 



of walls. 



3 a. Tangential section, x!8. 



Keokuk group, Warsaw, 111. 

 Illinois State Museum. 



Fig. 4. STENOPOKA MONTIFEKA Ulr 438 



4. Tangential section, x18, showing wall structure and extremes in thickness 



of walls. 



4 a. Tangential section of explanate form. 



4 b. Vertical section, x!8, showing irregular moniliform character of walls. 



Keokuk group, Otter Creek, Jersey Co., 111. 

 Illinois State Museum. 



Fig. 5. STENOPOKA INTEHCALAKIS Ulr 439 



5. Tangential section, x!8, showing the mesopores and other features of 



the species. 



5 a. Vertical section, x!8, showing the discontinuous mesopores and the ex- 



treme paucity of diaphragms. 

 Keokuk group, Warsaw, 111. 

 Illinois State Museum. 



