PLATE XXXVI. 

 Pecopteris Jenneyi D. W. 



80.) 



Fig. 1. Portions of two Interal pinnas from a part of whicb tlie organic residue has been removed. 

 U. S. Nat. Mus., 5598. 

 la. Single pinnule of the same (slightly enlarged). 



16. Photographic enlargement of pinna of same specimen, showing very coarse nervation. x2. 

 2. Another example of the same species, in which the pinnules are proportionally longer. 

 U. S. Nat. Mus., 5599. 



Pecopteris cf. arborescens Brougn. f 



(Page 78.) 



Fig. 3. Pinnie on the lower jtortion of which the sporangia are in the process of development. U. S. 

 Nat. Mus., 5596. 



