PLATE 39. 



Michelinia corrugata, Nov. Spec. Devonian. 



1. Upper surface of a corallum from the Middle Devonian, Falls of the 



Ohio. Collection of the author. 



Michelinia niagarensis, Nov. Spec. Niagara. 



2. Portion of the upper surface of a corallum from the Upper Niagara 



white clay, near Louisville. Collection of the author. 



Michelinia prima, Nov. Spec. Niagara. 



3. Upper surface of a weathered specimen, in which the walls of the 



several corallets are seen separated; from the white clay of the 

 Upper Niagara, near Louisville. Collection of the author. 



4. Artificially attached to Figure 6 is a corallum whose lateral view 



showing epitheca is presented. Not photographed satisfactorily 

 on account of its color. From the same horizon, near Louis- 

 ville, as example 3. Collection of the author. 



5. Upper surface of a fragment showing tube-walls delicately spinulous, 



in exquisite preservation; from the same horizon and place as the 

 preceding example. Collection of Mr. McConathy. 



Michelinia plana, Nov. Spec. Devonian. 



6. Lateral view of a corallum from the dark red clay beds derived from 



the encrinal limestone of the Upper Devonian, near Louisville. 

 Collection of the author. 



Michelinia insignis. Devonian. 



7. Upper surface of a corallum whose corallets have thinner walls than 



the average specimen; from the encrinal limestone clay of the 

 Upper Devonian, near Louisville. Collection of the author. 



