PLATE 50. 



Cladopora aspera. Devonian. 



1. Front kiteral view of a corallum from the Lower Devonian rocks, 



Falls of the Ohio. Collection of the author. 



Cladopora expatiata. Devonian. 



2. Portions of fronds with part of pedicle, from the ferruginous clay of 



the Lower Devonian, near Louisville. Collection of the author. 



3. Front lateral view of a corallum (prostrate) from the Lower Devo- 



nian, Falls of the Ohio. Collection of the author. 



