PLATE 40. 



Michelinia prima, Nov. Spec. Niagara. 



1. Under surface of corallum previously figured in Plate 39; Fig. 4. 



Michelixia plana, Nov. Spec. . Devonian. 



2. Longitudinal section of a fragment from which the tabula? are removed 



so as to show the mural pores; from the encrinal limestone clay 

 of the Upper Devonian, near Louisville. Collection of the author. 



3. Longitudinal section of a fragment showing tabula? ; from the horizon 



and locality of the preceding example. Collection of the author. 



Michelixia insignis. Devonian. 



4. Oblique view of the upper surface of a corallum, from the encrinal 



limestone clay of the Upper Devonian, near Louisville. Collec- 

 tion of the author. 



5. Upper surface of a corallum from the horizon and locality of example 



4. Collection of the author. 



6. Vertical section of a corallum, showing tabula?, from the same horizon 



and locality as the preceding examples. Collection of the author. 



