676 NEW YORK STATE MUSEUM 



Plate 4 

 Thamnocladus clarkei White 



Page 596 



FIG. 



1 Portions of several segments, probably belonging to the 



same frond or the same tuft. The different portions lie 

 at different levels in the bed, the larger ones passing 

 out at the back side of the slab. Natural size. 

 Same slab as pi. 3. 



2 Isolated portions of two segments showing more dis- 



tinctly the mode of division, the aspect of the terminal 

 portions and the lamina. Natural size. 

 Cat skill at Factoryville, Wyoming co. Pa. No. 25072, 

 Lacoe collection, United States national museum. 



