138 MESSRS. W. WEST AND G. 8. WEST ON 
It differs from Closterium juncidwm, Ralfs, in its curvature, in the truncate and 
relatively broader apices, and in its peculiar striolation. 
62. CLOSTERIUM GRACILE, Bréb. 1839; in Mém. Soc. Sci. Nat. Cherbourg, iv. 1856, 
p. 155, t. 2. fig. 45. C. limneticum, Lemmermann, in Plóner Forschungsberichten, 
Teil vii. 1899, p. 28, t. 2. figs. 39-41. 
Hab. Paddyfield between Kosgoda and Urahaighasmahendai. 
Var. TENUE, nob. C. limneticum, var. tenue, Lemm. l. c. t. 2. figs. 42-44; cfr. West A 
G. S. West, in Journ. Bot. xxxviii. 1900, p. 290. 
Long. 69-1104; lat. 2:5-3:5 u. (Pl. 18. figs. 22, 23.) 
Hab, Paddyfields, Heneratgodha. 
Lemmermann's measurements of the length of C. limneticum, var. tenue, are obviously 
wrong; he gives it as “ 255-308 au," whereas his figures measure 80-904, the latter 
agreeing with our own measurements. 
63. CLOSTERIUM ATTENUATUM, Ehrenb. 1838; Ralfs, Brit. Desm. 1848, p. 169, t. 29. 
fig. 5. 
Long. 432 u; lat. 42 p. 
Hab. Paddyfields, Heneratgodha. E 
64. CLOSTERIUM ACEROSUM, Ehrenb. 1831; Ralfs, /.c. p. 164, t. 27. fig. 2. 
Long. 790 4; lat. 50 a. 
Hab. In small pond, Peradeniya. Paddyfields, Heneratgodha. 
65. CLOSTERIUM LINEATUM, Ehrenb. 1834; Ralfs, /. c. p. 173, t. 30. fig. 1. 
Long. 7504; lat. 25; lat. apic. 9B p. 
Hab. Pond, Victoria Park, Colombo. 
66. CLosrERIUM DELPONTII, Wolle, in Bull. Torr. Bot. Club, xii. 1885, p. 2. C. Ralfsii, 
Bréb., var. Delponti, Klebs, 1879. C. crassum, Delp. (non Rabenh.). 
Long. 4224; lat. 234; lat. apic. 4'8 n. j 
Hab. Paddyfields, Heneratgodha. 
Var. ELONGATUM, var.n. (Pl.18.fig. 20.) Var. cellulis elongatis, diametro circiter 35-plo 
longioribus ; striis 11 (visis). 
Long. 565; lat. 15°54; lat. apie. Aan, 
Hab. With the typical form. 
67. CrosrERIUM Rarrsir Bréch, in Jenner, Fl. Tunbr. Wells, p. x; Ralfs, Brit. Desm. 
1848, p. 174, t. 30. fig. 2. 
Var. HYBRIDUM, Rabenh. Flor. Europ. Algar. iii. p. 135. 
Long. 700 4; lat. 384; lat. apic. 11 p. 
