PLATE XVI I. 



Figs. l-2a. Merten&ides bullatus (Bunb. species). Pages 33 to 39. 

 Fig. 1. Portion of the lower part of a compound sterile pinna. 

 Fig. 1 a. Pinnules of Fig. 1, magnified to show nervation. 

 Fig. 1 b. Heteroniorphoua pinnule of Fig. 1, magnified. 

 Fig. 2. Upper portion of a compound sterile pinna. 

 Fig. 2 a. Pinnules of Fig. 2, magnified to show nervation. 



