PLATE 68. 



Syeixgopoba hisixgebi. Devonian. 



1. Upper surface of a fragment from the ferruginous clay of the Lower 



Devonian, near Louisville. 



Syeixgopoba stbamixea, Nov. Spec. __ Devonian. 



2. (Upper right specimen.) Lateral view of a fragment whose horizon 



is about one foot lower than the lowest stratum in which S. 

 hisingeri is found ; from the ferruginous clay of the Lower Devo- 

 nian, near Louisville. 



Syeixgopoba tabulata. Devonian. 



3. Lateral view and also an oblicpie view of the upper surface of a 



fragment from the red clay of the Middle Devonian, near Louis- 

 ville. 



Syeixgopoba bouchaedi. Devonian. 



4. Under surface of a corallum whose appressed corallets indicate the 



form of the marine object to which the incipient community was 

 attached; from the Middle Devonian red clay, near Louisville. 



5. Upper surface of a corallum incrusting Cyathophyllum corniculum, 



from the upper rock strata of the Middle Devonian, Falls of the 

 Ohio. 

 The specimens figured in this plate belong to the collection of the 

 author. 



