PLATE 50. 



Cladopora aspera. Devonian. 



1. Front lateral 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. 



