PLATE XLVII. 



BEITTSIA PROBLEMATICA L), W. 



(Page 98.) 



Fig. 1. View of frond in wliioh the pinn:i; are rolled back on all sides, showing the broad central 

 rachis. Portions of the thalloid expansions are seen on the upper right. The photograph 

 is inverted. U. S. Nat. Mus., 5683. 



2. Opposite side of the same sjiecimen, with inrolled pinnaj. 



3. Expanded frond, from which the pinnules have been removed, showing the broad lobular 



expansions of the fleshy or thalloid wing of the rachis. The light spots in the sinuses of 

 the lobes correspond to the attachment of the imbricated pinnules. The margins of the 

 lobes, though thinning, are hardly so uneven as the retouching indicates. U. S. Nat. JIus., 

 5724. 



4. Enlarged detail of one of the lobes or fleshy expansions of the rachis of a lateral pinna. The 



vascular bundles are seen to diverge from the axis and pass to the sinus at the upper 

 angle of the lobe, where a distinct carbonaceous residue of the base of the pinnule usually 

 remains. The character of the surface of the lobe, which is destitute of vascular trace, 

 is also shown in the enlargement. X5. 



5. Portions of two of the " pinnules" which are attached at the sinuses of the lobes. The detail 



enlargement shows the nervation and a very small portion of the margin, including one 

 of the teeth. U. S.Nat. Mus., 5723. X5. 



PEOOPTERIS Cf. ARBORESCENS BrOUgU. ? 



(Page 78.) 



Fig. 6. Fertile pinnie. U. S. Nat. Mus., 5595. 



Aphlebia subgoldenbergii D. W. 



(Page 110.) 



Fig. 7. Fragment showing lateral divisions or pinn;e, with thin lobes or pinnules traversed by broad, 

 flat vascular bands. Lacoc collection, U. S. Nat. Mus., 9599. 

 7a. Portion of the same enlarged to show the form of the lobes. X2. 



404 



