140 MESSRS. W. WEST AND G. S. WEST ON 
This species approaches Closterium porrectum, Nordst., but is distinguished by its 
smaller size, its narrower cells, and the fewer number of the strong costs. The 
curvature of the cells varies very considerably. 
75. CLOSTERIUM NEMATODES, Joshua, in Journ. Linn. Soc., Bot. xxi. 1886, p. 652, t. 22. 
figs. 7-9. 
Lat. 18 u ; apicibus 172 inter se distantibus. 
Hab. Paddyfields, Pandure and Heneratgodha. Also between Kosgoda and Ura- 
haighasmahendai. 
76. CLOSTERIUM VALIDUM, sp. n. (Pl. 18. fig. 19.) C. submediocre, robustum ; cellulis 
diametro 7—8-plo longioribus, valde curvatis, sensim attenuatis polos versus, polis 
latis triangularo-subrotundatis; membrana rufescente, valde striata, striis visis 
circ. 15. 
Lat. 32,4; apicibus 176 4 inter se distantibus. 
Hab. Paddyfield between Kosgoda and Urahaighasmahendai. 
Perhaps the nearest species to this is C. lagoense, Nordst., but C. validum is much 
larger and not so attenuated towards the poles. The apices are distinctly angular, but 
not dilated, and the striolations of the cell-wall are very much stronger. 
Compare also with Cl. Isidis, Cohn (* Desm. Bong., Festschrift natur. Ges. zu Halle, 
1879, p. 6, t. 11. fig. 15). : 
77. CLosrERIUM Dian#, Ehrenb. 1838; Ralfs, Brit. Desm. 1848, p. 168, pl. 28. fig. 5. 
Hab. Paddyfields, Pandure. Paddyfield between Kosgoda and Urahaighasmahendai. 
78. CLOSTERIUM PsEUDODIANJE, Roy, in Scot. Nat. x. 1890, p. 201; ‘Scott. Deem ` Ann. 
Scot. Nat. Hist. 1894, t. 1. fig. 4. 
Small forms :—lat. 7:6-8 4; apicibus 119-129 „u inter se distantibus. 
Hab. Paddyfields, Heneratgodha. 
79. CLOSTERIUM CALOSPORUM, Wittr. in Nov. Act. Soc. Upsala, ser. 3, vii. 1869, p. 23, 
t. 1. fig. 11. 
Lat. 124; apic. 106 & inter se distantibus. 
Hab. Paddyfields, Heneratgodha. 
80. CrosrERIUM CYNTHIA, De Not. Desm. Ital. p. 65, t. 7. fig. 71. 
Hab. Pond, Victoria Park, Colombo. Paddyfields, Heneratgodha. Paddyfield between 
Kosgoda and Urahaighasmahendai. Muddy bottom of pool at foot of Hakgala Rock. 
81. CLosrERIUM VENUS, Kuetz. Phyc. Germ. 1845, p. 130. 
Hab. Paddyfield between Kosgoda and Urahaighasmahendai. Paddyfields, Pandure. 
In tank, Peradeniya. 
" SE e SE E * s E " 
— X NBI M EUREN e i CS MESE 
