PLATE III. 



PIS. PA&E 



1. Fucus nodosus 43 



1 a, segment of a spore-receptacle. 



2. Fucus anceps 44 



2 a, pointed spore-receptacle. 



2 I, branchlet with antheridia. 



3. Haliseris polypodioides . . 57 



3 a, portion of frond with sorus. 



4. Sphacelaria filicina .77 



4 flj a pinna, magnified. 



