166 



Plate VII. 



Page. 

 liatostoina rariahHc ririch ITid 



1. Shallow Tangential section, showing thin walls. Weishurg, 



Ind.» 

 la. Deep tangenital section, showing thick walls. Weisburg, Ind. 

 lb. Tangential section, showing numerous indistinct acantho- 



pores. Ballstown, Ind. 

 Ic. Longitudinal section. Weisburg. 

 Batostnma pronseri nov 1 ."1 



2. Typical tangential section, showing large acanthopores and 



numerous mesopores. Weisburg. Ind. Upper Waynesvillt. 



2a. Tangential section, showing couiniunication pores. Weis- 

 burg, Ind. Upper Waynesville. 



2b. Tangential section, showing unusually large and numerous 

 acanthopores. Weisburg. Ind. Upper Waynesville. 



2c. Longitudinal section. 

 liato.stoiiia ru rill lis (James) 14N 



3. Tyi)ieal tangential section. 



3a. Longitudinal section, showing spiny acanthopores crossed 

 by diaphragms. 



' All figures magnified 44 diamotfrs. 



