PLATE III. 



FIG. PAGE 



1. Fucus noclosus 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 a, a pinna, magnified. 



