PLATE XII. 



Sphe>optekis mixta Scbiiup. 



( Page 35. ) 



Fig. 1. Fragmeut of .secondary piuna showiug form with compact pinuules and slender raoLi.s. The 

 ;ipex of one of the tertiary pinme of this species is seen on the far right, a small fragmeut 

 of CalllptericUum SiiUivantii (Lx.) Weiss lying between. U. S. Nat, Mus., 5714. 

 la. Detail of pinnule of the same specimen, showing characteristic slightly crennlate margin. 



X2. 

 2. Portion of a primary ( ?) pinna of the species. The specmieii, though somewhat dim, is 

 interesting as showing the delicacy of the slender graceful pinnae and the smaller ordi 

 nary pinnules. II. S. Nat. Mus., 5687. 



Sphenopteris Lacoei D. W; 



(Pag6 3><.) 



Fig. 3. Pinuiu showing small ultimate pinuse or lobes. Original described in Bull. U. S. Geol. Survey, 

 No. 98, p. 56. U. S. Nat. Mus., 5802. 

 3a. Enlarged detail showing broadly rounded pinnules or lobes. x2. 



-334 



