PLATE 23. 



Favosites arboe, Nov. Spec. Devonian. 



1. Lateral view of a fragment of a frond from the Lower Devonian 

 strata, Falls of the Ohio. Collection of Mr. McConathy. 



Favosites cymosus, Nov. Spec. Devonian. 



2. Lateral view of a corallum from the blue clay of the Middle Devo- 



nian, falls of the Ohio. Collection of the author. 



3. Upper surface of a corallum from the Lower Devonian, Falls of the 



Ohio. Collection of the author. 



4. Lateral view of a corallum from the same place and horizon as 



example 3. Collection of the author. 



5. Lateral view (prostrate) of a "sprout," or cyme, of uncommonly 



elongated growth, from the horizon and locality of example 2. 

 Collection of the author. 



