PLATE 71. 



Drymopora nobilis. Devonian. 



1. Lateral view of a corallum from the Lower Devonian rocks, Falls 



of the Ohio. 



2. Upper surface of a corallum, from the same horizon and jilace. 



3. Upper surface of a corallum of procumbent habit; from the same 



place. 



4. Basal corallcts of a young community, attached to Cyathophyllum 



halli; from the ferruginous clay of the Lower Devonian, near 

 Louisville. 

 Examples from the collection of the author. 



