156 



I'LATE II. 



rag:e. 



liutostoina. raridhilc riricli 150 



1. Typical tanj^eiUial sectldii, x IS. Ballstown, iiul. 



la. Tangential section, showing unusnally large acantliopoves 



and faint median lamina, x IS. Weisburg. Ind. 

 Ih. Shallow tangential section, showing thin walls and few 



acanthopores, x IS. Weisbnrg, Ind. 

 le. Ramose specimen, natural size. Weisburg, Ind. 



