Plate III; Figures ii to 15; All Magnified iooo 



Diameters. 



Fig. 11. Anabana gigantea Wood . . page 22 



Fig. 12. Flos-aquce Kiitz. or circinalis 



(Rab.) Kirch " 



Fig. 13. Lyngbya sp. (?).... 19 



Fig. 14. Oscillatoria chalybea Mertens 

 Fig. 15. amphibia Ag. 



