IM.AIK V. 



rase 



HdloslniiKl l)l().sf«'i I uov I.'l 



1. Tangential section, showing eonunnnlcatioii pores, x is. 



Lower Liberty, 

 la. Tangential section, showing nnnsnally large acantliopores. 



X IS. Lower Liberty, 

 lb. Ty])ical tangential section, x IS. Upper Waynesville. 

 Ic. Surface, showing numerous niesopores and acanthopores, x D. 

 Lower Liberty. All specimens from Weisburg. 



