(\7i NBW YORK STATE MUSBUM 



Plate 3 



Thamnocladus clarkei White 



Page 596 



FIG. . 



1 (Ireater portion of a larjjfc frond partly buried in tlie 

 matrix. The segments are somewhat macerated and 

 show tlie effect of current dragging. Natural size. 

 Chemung, at East Windsor N. Y. Xew York state 

 museum. 



