BY G. I. PLAYFAIR. 135 



SpiRULiNA LAXissiMA G. S. West. (PI. vi., f.l6). 



Spira laxissima diam. 4; anfract. 10-15 inter se distant.; trich. 

 diam. 1-1 J /x. 



Lismore (20), in Lynghya stratum (26). 



A very rare Spiridina, only known Ijesides from Tanganyika. 

 Generally found here in short pieces, 30-80 ju- long. Cf . G. S. 

 West, Third Tanganyika Exp , p.l78, P1.9, f.6. 



Spirulina Corakiana, n sp. (PI. vi., f.l7). 



Trichomata angustissima in spiram laxissimam regularem 

 diametro 2 /x ?equaliter contorta; anfractihus 6-10 inter se dis- 

 tantibus; cytoplasmate pallide serugineo et homogeneo. Crass, 

 trich. 0*8 /x. 



Lismore (12); Coraki, with Spirulina rnajor (27). 



Genus Merismopedia Meyen. 

 Merismopedia punctata var. oblonga, n var. (PI. vi., f 18). 

 Cellulse oblongfB, long. 3, lat. 2 /x. 

 Lismore (2). 



Merismopedia elegans A.Br. (PL vi., f.l9). 



Coenob. long. 300, lat. 200; cell, sphaeric. diam. 4-5, oblongis 

 long. 6-7, lat. 4-5 /x. 



Lismore (9, 18). 



Ccenobia very large and membranous. Cells very numerous, 

 1024 and 2048 actually observed (32 rows x 32 and 64 rows x 32), 

 closely approximated, only 1-2 /x between, pale blue or pale green, 

 oblong, constricted or spherical according to stage of division. 

 Syn., M. nova Wood, cf. Tilden, Minnesota Algge, i., pp.42, 43. 



Genus Ccelosph.erium Nag. 



CCELOSPH^RIUM KUETZINGIANUM Nag. (PI. vi., f.20). 



Ccenob. long. 40, lat. 36; cellulis clare cseruleis, diam. 3 /x. 

 Lismore (20). 



Var. PUNCTATA (Nag.) mihi. (PI. vi., f.21). 

 Coenob. diam. 6-16, cell, diam 2 /x. 

 Lismore (16). 



