PLATE 60. 



Platyaxum (Nov. Gen.) turgidum. Devonian. 



1. 2. Fragments showing front lateral views, from the Lower Devonian, 

 Falls of the Ohio. 



Platyaxum (Nov. Gen.) fischeri. Devonian. 



3. Fragment showing front lateral view, from the Lov/er Devonian, 



Falls of the Ohio. 



Platyaxum (Nov. Gen.) canadense. Devonian. 



4. Front lateral view of fragment from the Lower Devonian, Falls of 



the Ohio. 



5. Rear lateral view of fragment from dark-red encrinal limestone clay 



of the Upper Devonian, near Louisville. 



Platyaxum (Nov. Gen.) undosum, Nov. Spec. Devonian. 



6. Front lateral view of a fragment from the Lower Devonian, Falls of 



the Ohio. 

 The examples herein figured belong to the collection of the author. 



