PLATE 20. 



Fayosites radiciformis. Devonian. 



1. Lateral view of a corallum, whose older corallets have their tubes 



closed by opercula; from the Lower Devonian, Falls of the Ohio. 

 Collection of the author. 



2. Lateral view (prostrate) of a corallum, split at the upper end so as to 



show a longitudinal section of the corallets; from the same horizon 

 and locality. Collection of the author. 



3. Lateral view of a jejune frond; corallets extraordinarily small; 



horizon two feet above that of examples 1 and 2; Falls of the 

 Ohio. Collection of the author. 



