Marine Alyce of Benuick-on-Tweed. 387 



Ealfsia clavata, Crouan. Fig. 22. 

 Fig-. 22. — Sporangium and paraphysis for comparison with fore- 

 going, 250 diam. 

 N.B. — In the original explanation of this Plate the magnifications 

 were very much over-estimated. 



PLATE IX. 



Batxersia mikabilis, Rhe. Figs. 1-4. 

 Fig. 1. — Plant natural size. Figs. 2, 3, 4. — Filaments and 

 sporangia, 100 diam. 



Sphacelaria CjEspitula, Lyngb. Figs. 5-8. 



Fig. 5. — Plant natural size. Fig. 6. — The same, 10 diam. Fig. 



7. — Plurilocuiar sporangia, 100 diam. Fig. 8. — 

 Plurilocular sporangium, 200 diam. 



PLATE X. 

 Sphacelaria pltjmigera, Holmes. Figs. 1-3. 

 Fig. 1. — Plant natural size. Fig. 2. — Longitudinal section of 

 branch, to show secondary branches and unilocular 

 sporangia, 50 diam. 

 3. — Transverse section of stem; 50 diam. 



Ceuetopteris plumosa, Ktz. Figs. 4 6. 

 Fig. 4. — Plant natural size. Fig. 5 — Section of stem to show 

 special fruit branches and plurilocular sporangia, 50 

 diam. Fig. 5a. — Special fruit branch and plurilo- 

 locular sporangia, 50 diam. Fig. 6. — Transverse 

 section of stem with unilocular sporangia, 50 diam. 

 Fig. 6a. — Special fruit branch and unilocular spor- 

 angia, 150 diam. 



Cladostephus spongiosus, Ag. Fig. 7. 

 Fig. 7. — Longitudinal section of stem to show special fruit 

 branches and unilocular sporangia, 50 diam. 



Hat.fsia verrucosa, Aresch. Fig. 8. 

 Fig. 8. — Section of Frond with plurilocular sporangia, 120 diam. 



