38G Marine Algce of Berwick-on-Tweed. 



EXPLANATION OF THE PLATES. 



PLATE VII. 



Fig. 1. — Polycystis pallida (Ktz.) Farlow, on Sphacelaeia 



radicans, Barv. Natural size. 

 ,, 1a. — Portion of the same. 250 diam. 

 ,, 2. — Portion of a filament of Rhodoohorton Rothii (Eng.Bot.) 



Naeg., with. a. Dermocarpa prasina, Bornet, and b. 



Dermocarpa Schotjsboei, Z?orn^, epiphytic. 250 diam. 

 ,, 3. — Spirulina pseubo-tenuissima, Cm. 650 diam. 

 ,, 4. — Spirulina tenuissima, Ktz. 650 diam. 

 ,, 5. — Enteromorpha canaltculata, Nob. Natural size. 

 ,, 6. — Portion of same. 75 diam. 

 „ 7. — Section of frond of same. 75 diam. 

 „ 8. — ITlothrix discifera, Kjellm. 75 diam. 



PLATE VIII. 



(Reprinted from tit?- Plate in, the Linnean Society's Journal . ) 



Phyllitis filiformis, Batters: Figs. 1-6. 



Fig. 1. — Plant natural size. Figs. 2-3. — Roots, 150 diam. Fig. 

 4. — Portion of Frond with plurilocular sporangia, 

 150 diam. Fig. 5. — Section of Frond, 150 diam. 

 Fig. 6.— The same, 250 diam. 



EcTOCARPUS Holmesii, Batters. Figs. 7-16. 



Fig. 7. — Plant natural size. Fig. 8. — The same, 50 diam. Figs. 

 9-12. — Specimens of plurilocular sporangia, 120 

 diam. Figs. 13-15.— Unilocular sporangia, 150 

 diam. Fig. 16. — Distorted cell, 150 diam. 



Ralfsia spongiocarpa, Batters. Figs. 17-21. 

 Figs. 17, 18.— Plant natural size, in situ. Fig. 19. — Sporangium 

 and paraphysis, 250 diam. Fig. 20. — Branching 

 vertical filament, 250 diam. Fig. 21. — Terminal 

 sporangium, 250 diam. 



