PLATE 28. 



Favosites mundus, Nov. Spec. Devonian. 



1. Upper surface of a coralkim from the ferruginous clay of the Micklle 



Devonian, near Louisville. Collection of the author. 



2. Lateral view of a corallum, the tubes of many of whose corallets are 



closed with opercula; from the blue clay of the Middle Devonian, 

 Falls of the Ohio. Collection of the author. ' 



Favosites proximus, Nov. Spec. Devonian. 



3. Lateral view of a sub-ramous corallum, in some of whose tubes 



appear imperfect opercula; a basal expansion of Favosites clausus 

 is attached to its upper portion; from the Lower Devonian strata, 

 Falls of the Ohio. Collection of the author. 



