y 



PLATE 42. 



Michemnia clappi. Devonian. 



1. Oblique lateral view of a corallum from the blue clay of the Middle 



Devonian, Falls of the Ohio. 



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



3. Upper surface of a corallum from the ferruginous clay of the Middle 



Devonian, near Louisville. 



4. Lateral view of the example figured in Plate 41, Fig. 2. 

 The specimens figured are from the collection of the author. 



