EXPLANATION OF PLATES. 131 



PLATE XI. 



Figs. 1-3. Acrostichides rhombifolius, 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 ot pinnules. 

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

 cies that is not uncommon. 



PLATE XII. 



Figs. 1,2. Acrostichides rhombifolius, spec. nov. Pages 29 to 32. 



Fig. 1. A common form of the sterile pinnules with prolonged tips. 



Fig 1«. Pinnules of Fig. 1 magnified to show nervation. 



Fig. 2. Portion of the upper part of a compound sterile pinna, where the ultimate pinna are 

 becoming simply lobed. 

 FIGS. 3,3a. Acrostichides micropliyllus, spec. nov. Pages 33 to 34. 



FIG. 3. Gives the largest form seen of this species. 



Fig. 3 a. Pinnule of Fig. 3, magnified to show nervation. 



PLATE XIII. 



Figs. 1,2. Acrostichides rhombi/olius, spec. nov. Pages 29 to 32. 



Fig. 1. Represents the upper part of a compound sterile pinna where the pinnae have become 

 simple pinnules. 



Fig la Pinnule of Fig. I magnified to show nervation. 



Fig. 2. Upper portion of a compound fertile pinna where the ultimate piunre are simply lobed. 

 Figs. 3, 3 o, 3 h. Acrostichides rhombifolius, var. rarinervis. Pages 32 to 33. 



Fig. 3. Portion of a normal, sterile, compound pinna. 



Fig. 3 a. Pinnules from the lower part of Fig. 3. 



Fig. 3 6. Pinnules from the upper part of Fig. 3 magnified to show nervation. 



PLATE XIV. 



Figs. 1,2 a. Acrostichides rhombifolius, spec. nov. Pages 29 to 32. 



Fig. 1. Fragment of a large fertile compound pinna of common occurrence. 

 FIG la. Pinnules of Fig. 1 magnified to show nervation and fructification. 

 FIG. 2. Fragment of a compound fertile pinna showing pinnules more rounded than those of Fig. 



1 ; also common. 

 Fig. 2 a. Pinnules of Fig. 2 magnified to show nervation and fructification. 



PLATE XV. 



FIGS. 1, 1 a. Meriensides distans, spec. nov. Pages 39 to 40. 



Fig. 1. Portion of a compound pinna of the normal kind. 



Fig. 1 a. Pinnules of Fig. 1 magnified to show the fructification. 

 Figs 2-5. Mertensides bullatus (Bunb. species). Pages 35 to 39. 



Fig. 2. Portion of a compound fertile pinna of the most common kind, taken from the lower part 

 of the pinna. 



Fig. 3. Portion of an ultimate sterile pinna, taken from the lower part of the compound pinna. 



Fig. 3 a. Pinnule of Fig. 3 magnified to show nervation. 



Fig. 4. Portion of a compound sterile pinna, showing large heteromorphous pinnules. 



Fig. 5. Portion of a heteromorphous pinnule of the largest size. 



