PLATE VII. 



PIG. PAGE 



1. Chorda lomentaria 55 



1 «, transverse section of part of frond, mag- 



nified. 



2. Padina pavonia 57 



2 a, recurved margin, magnified. 

 2 b, fringe, magnified. 



2 c, young sorus, magnified. 



2 d, old sorus, magnified. 



3. Dictyota dichotoma 60 



3 a, sorus. 



4. Elachista fucicola 71 



4«, branched thread of tubercle, with spore, 

 magnified. 



5. Melobesia polymorpha 131 



5 «, portion of frond, showing spore-concepta- 

 cles, magnified. 



