UY G. J. PLAYFAlU. 501 



Merismopedium cyaneum, 11. sp. (Text-fig. 2/). 

 Celluh« o vales vel oblong^e; cytoplasmate cyaneo. 

 Cell. long. 5-6, lat 3/x. Potts Hill (121). 



Ccenobium of 4 cells measured 12 x 6/i, the cells not quite 

 divided; the colour of the cell-contents a strong bright blue. 



Merismopedium elegans v. constrictum, n.var. (Text.fig.2r/). 



Ccenobium membranaceum, extensum, e cellulis permultis, con- 

 fertis, compositum; cellulis oblongis medio constrictis; cytoj^las- 

 mate dilute Cc^^ruleo vel dilute viridi. 



Ctenob. long. c. 300, lat. c. 200; cell. long. 6-7, lat. 4-5/x. 



Lismore, Richmond R. (184, 193). 



The crenobia were wide-spreading, containing 1024 cells (32 x 

 32) or so. Cells oblong, constricted in the middle, pale blue or 

 pale green. A few cells of the type present, oblong, not con- 

 stricted, 6 X 4//. 



Merismopedium duplex, n.sp. (Text-fig. 2A). 



Cellulfe sph£ericc\3 vel ovales, remotte ; cytoplasmate dilute 

 creruleo. 



Cell. long. 4, lat. 3/i Coogee (4). 



Coenobia small, about 30 x 25f(., consisting of 8-32 cells gener- 

 ally found half -divided, remote. Contents pale blue. 



Fani. 08CILLAT0RIACE.*:. 

 Genus Oscillatoria Vaucher. 



OSCILLATORIA FLEXA, n.Sp. (PI. Hv., fig.l). 



►Stratum mucosum, foliaceum, saturate viride; fills arete in- 

 tricatis rectis, juxta apices subito deflexis, baud attenuatis, 

 apicibus rotundatis, vaginis tenuissimis; trichomatis dilutissime 

 ferugineis, ad genicula baud constrictis; articulis subquadratis 

 vel cylindraceis; dissepimentis fegre cernendis, haud granulatis; 

 cytoplasmate tenui-granuloso. 



Diam. fil. 21-3, cell. alt. 2-8/x. Lismore (317). 



A mucous stratum of dark green flakes in shallow water at 

 the grassy edge of a swampy pool, in quantity. The filaments 

 were very lively under the microscope, as is usual with species of 



