LIST OF PLATES. 



1. Sargassum vulgare. 



la, air-vessel. 



1 b, spore-receptacles. 



2. Halidrys siliquosa. 



2 a, section of receptacle, 



showing spores. 



3. Pycnophycus tuberoulatus. 



3 a, section of receptacle, 



showing spores. 



4. Leathesia tuberiformis. 



4 a, filaments with spores. 



1. Fucus vesioulosus. 



1 a, section of receptacle, 



showing spores. 



2. Asperococcus Turneri. 



2 a, part of frond, showing 



spore-clusters. 

 8. Laurencia csespitosa. 



3 a, tip of branch, showing 



tetraspores. 



PLATE III. 



1. Pucus nodosus. 



1 a, segment of a spore- 

 receptacle. 



2. Fueus anceps. 



2 a, pointed spore-recep- 

 tacle. 



2 b, branchlet with anthe- 



ridia. 



3. Haliseris polypodioides. 



3 a, portion of frond with 



sorus. 



4. Sphacelaria filicina. 



4: a, a, pinna. 



PLATE IT. 



1. Fucus canaliculatus. 



1 a, part of spore-recep- 

 tacle. 



1 b, section of spore-recep- 



tacle. 



2. Delesseria ruscifolia. 



2 a, tip of leaf with spore- 



conceptacle. 



3. Schizymenia edulis. 



3 a, section of frond, show- 



ing spore-clusters. 



PLATE V. 



1. Alaria esoulenta. 



Id, section of part of a 

 sorus. 



2. Laminaria sacoharina. 



2 a, slice of frond. 



