PLATE LI. 



PAGE. 



Fig. 1. Aletiioptehis HoLDENi, And 420 



Lower portion of the plant. Natural size. 



Fig. 2. Alethopteris HoLDENi, And 420 



tJpper portion of the plant. Natural alee. 

 Sa. Nervation magnified. 



Fig. 3. Alethoptbkis BuNBDKYi, And , 421 



Natural size. 

 3a. Nervation enlarged. 



Fig. 4. AstbrophYllItEs ? minutUs, And 424 



4a. Portion enlarged. 



