PLATE 69. 



Syringopora tubiporoides. Devonian. 



1. Oblique view of the Upper surface of a corallum from the ferruginous 



clay of the Lower Devonian, near Louisville. Collection of the 

 author. 



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



of the Ohio. Collection of Mr. Gaines. 



3. Basal expansion incrusting Favosites emmonsi, from the Lower De- 



vonian red clay, near Louisville. Collection of Mr. McConathy. 



Syringopora perelegans. Devonian. 



4. Oblique section of a corallum from the upper strata of the Lower 



Devonian group of rocks, Falls of the Ohio. Collection of the 

 author. 



5. Variety (inverted) from the same locality as example 4, but whose 



horizon is a little higher, showing more widely separated corallets, 

 and more remote processes of connection. Collection of the author. 



