PLATE XV. 

 Sphenopteris Brittsii Lx. 



(Page 53.) 



Fig. 1. Fragment showing the long, slender, secondary ( ?) pinnije, in which the teeth of the pinnules 

 are less buried in the matrix than usual. U. S. Nat. Mns., .5626. 



Irt. Enlarged pinnule from upper part of the same segment, showing punctations caused by 

 minute glands or the bases of hairs. x2. 



16. Similar detail from the lower pinna in the same specimen. x2. 



Sphenopteris canneltonensis D. W. 



(Page 55.) 



Fig. 2. Fragment showing the form of the pinnules and lobes, drawn natural size. U. S. Nat. Mus., 

 5567. 



Sphenopteris capitata D. W. 



(Page 57.) 



Fig. 3. Section showing the rather lax aspect of the pinn;e and pinnules. U. S. Nat. Mns., 5662. 

 3a. Enlarged detail of ultimate pinna showing very obtuse erect lobation of broad pinnules 

 marked by appressed short hairs, which are really much more numerous than the drawing 

 indicates. x2. 



340 



