LIST OP PLATES. 



3. Ptilota plumosa. 



3 a, comb-like brancUet. 

 3 6, spore-clusters. 



PLATE XIII. 



1. Desmarestia aculeata. 



1 a, branchlet of a young 



frond. 



2. Cladostepbus verticillatus. 



2 a, whorls of brancMets. 

 2 J, branchlets. 



2 c, branchlets witb spores. 



3. Ulva latissima. 



3 a, cellules of upper layer 



of frond. 



PLATE XIV. 



1. Sporoohnus pendunoulatus. 



1 o, a mature receptacle. 



2. Codium bursa. 



2 a, fibres of frond. 



3. Enteromorpha intestinalis. 



3 a, small portion of frond. 

 4 Calothrix confervicola (on 



Ceramium ruhrum). 



4 a, proliferous thread. 



4 b, spores. 



4 c, portion of thread. 



PLATE XT. 



1. Striaria attenuata. 



1 a, part of a branch with 



spores. 



2. Cladophora Isetevirens. 



2 a, part of a branch. 



3. Cladophora lanosa. 



3 a, part of a branch. 



4. ChaetomorphaMelagonium. 



4 a, cells of thread. 



PLATE XVI. 



1. Bryopsis plumosa. 



1 a, a plumule. 



2. Enteromorpha oompressa. 



2 a, part of a frond. 



3. Cladophora faleata. 



3 a, branch. 



