PLATE 98. 



Blothrophtllum decorticatttm. Devonian. 



1, Lateral view of an adult corallum of average size and usual form, 



from the Lower Devonian rocks, Falls of the Ohio. 



2. Lateral view of the upper portion of a corallum partly imbedded 



in its rock matrix, with closely set explanate rims of the invag- 

 inating calyces ; from the rocks of the Lower Devonian formation, 

 near 'Louisville. 

 Collection of the author. 



