PLATE XVI. 



GORDAITES COMMUNIS Lx. 



with 

 Sphenopteris Beittsii Lx. 



(Pages 53 and 260.) 



The large leaf of the Cordaite:!, on the left, is slightly above the average iu size; the base is 

 wanting. A basal fragment is shown in PI. XLVI, while another small medial portion is seen in PI. 

 XXVII. U.S. Nat. Mus., 5702. 



The specimen of Sphenopteris Britisii, on the right, represents the ordinary aspect of the frag- 

 ments of that fern, though the photograph is obscure. U. S. Nat. Mus., 5706. 



342 



