PLATE XI. 



Figs. 1-3. Acrostichides rhombifoliiis, spec. nov. Pages 29 to 32. 



Fig. 1. Portion of a compound sterile pinna showing pinnules of the largest size. 

 Fig. la. Pinnules of the same magnified to show nervation. 



Fig. 2. Portion of the lower part of a compound sterile pinna to show the small size of the pin- 

 nules there. 

 Fig. 3. Fragment of a fertile ultimate pinna showing abnormal form of pinnules. 

 Fig. 4. Acrostichides microjriiyllus, spec. nov. Pages 33 to 34. Shows a very slender variety of this spe- 

 cies that is not uncommon. 



