PLATE 20. 
FAVOSITES 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. 
