PLATE 45. 



Alveolites mordax, Nov. Spec. Devonian. 



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



Devonian, near Louisville. Collection of the author. 

 2 Lateral view of a small corallum, with corallets of the smallest size, 



from the same horizon, near Louisville. Collection of the author. 



