P L A T E X X X V . 



Sphenopteris suspecta D. W. 



(Page 51.) 



Fig. 1. Fragment -witili large, rather lax, pinnules. U. S. Nat. Mus., .5650. 



2. Portions of secondary ( ?) jiinuaj with more compact pinnules. U. S. Nat. Mus., 5652. 

 2a. Eularged detail of pinnules in the lower part of the same specimen. x2. 



2b. Similar detail of jjinuule higher in position. x2. 



3. Enlarged detail of small pinnules of another specimen, No. 5649, U. S.Nat. Mus., doubtfully 



referred to the same species. X2. 



PBCOPTERIS CLINTON! Lx. ■ 



(Page 94. ) 



Fig. 4. Part of secondary ( f ) pinna showing lax habit of pinnules. U. S. Nat. Mus., 5605. 

 4a. Pinnule of the same enlarged, showing distant, thin nerves. X2. 



Pecopteris iiemitelioides Brougn. ? 



(Page 79.) 



Fig. 5. Fertile pinnie provisionally referred to this species. U. S. Nat. Mus., 5594. 



5a. Eularged detail of jiortiou of one pinnule to show the two rows of sori of the type of 

 Asterolheca, each consisting of four or five slender acute sporangia, inclined, in the com- 

 pressed specimen, toward the midrib of the pinnule. X4. 



Sphenopteris sp. 



(Page 66.) 



Fig. 6. Fragment sluiwiug lax pinnules, slightly stalked, with undulate margins. U. S. Nat. Mus., 

 5654. 

 6a. Enlarged detail of two jiiunules iu lower part of the same specimen. X2. 



380 



