388 Marine Algoe of Berwick- on-Tweed. 



PLATE XI. 



Rhododermis elegans, Cm., var. polystroruatica, Batters. 

 Figs. 1a and 1b. 

 Fig. 1a. — Section of Frond to show paraphyses and tetraspores, 

 100 diam. Fig. 1b. — Portion of same. 500 diam. 



Rhododermis parasitica, Batters. Figs. 2a. and 2b. 

 Fig. 2a. — Section of Frond showing paraphyses and tetraspores, 

 100 diam. Fig. 2b.— The same. 500 diam. 



Petrocelis Hennedyi, (Harv.) Batters. Figs. 3-4. 

 Fig. 3. — Section of Frond to show tetraspores, 50 diam. Fig. 

 4. — Section of Frond to show favellse. 50 diam. 



Cruoria pellita, Fries. Fig. 5. 

 Fig. 5. — Section of Frond to show favelke, 50 diam. 



Phyllophora Traillii, Holmes. Figs. 6-11. 

 Figs. 6-9. — Plant natural size. 



10. — Portion of a section through a cystocarp, 100 diam. 

 1 1 . — Portion of Frond with antheridia, 50 diam. 



Nitophyllum Bonnemaisoni, var. crassinerva, Nob. 



Fig. 12. — Portion of transverse section through the thickened 

 central portion of one of the segments of the frond, 

 50 diam. 



