PLATE 100. 



Blothrophyllum parvulum, Nov. Spec. Devonian. 



1. 2, 3. Lateral views of adult coralla, from the Middle Devonian 

 red clay, near Louisville. 



Blothrophyllum cinctutum, IVov. Spec. Devonian. 



4. Lateral view of an adult corallum of flexuous form, from the blue 



clay of the Middle Devonian, Falls of the Ohio. 



TNoTE. — The apex and several inches of the lower part of the corallum are concealed from view by 

 geniculation.] 



5. Anterior view and oblique view of the calyx of the upper portion 



of a corallum, from the same horizon and locality. 



6. Calyx of a corallum from the same horizon and locality. 



Blothrophyllum louisvillexse, Nov. Spec. Devonian. 



7. Anterior, or central-gap view of the upper portion of a corallum. 



8. View of the calyx of a corallum. 



Both from the blue clay beds of the Middle Devonian, Falls of 

 the Ohio. 



Blothrophyllum sessile, Nov. Spec. Devonian. 



9. Left lateral view of the corallum figured in Plate 99, Fig. 4. 



10. Left lateral view of a corallum from the same horizon and locality. 



11. Central gap view of a corallum with small apical scar of attach- 



ment, from the Middle Devonian red clay, near Louisville. 



12. View of the calyx of a corallum from the horizon and neighbor- 



hood of the preceding example. 



Cystiphyllum plicatum, Nov. Spec. Devonian. 



13. Posterior view of a corallum from the Lower Devonian rocks, 



Falls of the Ohio. 



[Introduced here for comparison with the Blothrophylla, to which it bears a superficial resemblance.] 



Blothrophyllum approximatum. Devonian. 



14. Lateral view of the upper portion of a corallum, from the Middle 



Devonian blue clay. Falls of the Ohio. 



15. View of the calyx of a large corallum from the Middle Devonian 



red clay, near Louisville. 



Specimens figured in this plate are from the collection of the 

 author, with the exception of Cystiphyllum plicatum, Fig. 13, 

 which belongs to Mr. Gaines, 



