PLATE II. 



TIG. PAGE 



1. Fucus vesiculosus 42 



1 a, section of receptacle, showing spores, 



magnified. 



2. Asperococcus Tumeri 64 



2 a, part of frond, showing spore-clusters, 



magnified. 



3. Laurencia csespitosa 120 



3 a, tip of branch, showing tetraspores, mag- 



nified. 



