PLATE 22. 
Favosites ARBOR, Nov. Spec. Devonian. 
Lateral view of the upper fronds of a corallum twenty-eight inches long, 
from the Lower Devonian, Falls of the Ohio. The entire left frond is 
incrusted with Stromatopora granulata; on its end appears a basal 
expansion of Favosites limitaris. Collection of the author. 
