'PLATE 113. 



Diphyphyllum archiaci. Devonian. 



1. Lateral view of specimen figured in Plate 112, Fig. 3. 



Diphyphyllum vernettilanum. Devonian. 



2. Lateral view of a fragment, from the Middle Devonian rocks, Falls 



of the Ohio. Collection of Dr. Knapp. 



Cyathophyllum davidsoni. Devonian. 



3. View of the upper surface of a corallum, from the Middle Devo- 



nian rocks, Falls of the Ohio. Collection of the author. 



