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. 



