THE FRESHWATER ALG.E OF CEYLON. 139 
Hab. Paddyfield between Kosgoda and Urahaighasmahendai. Paddyfields, Henerat- 
godha. 
68. CLOSTERIUM ROSTRATUM, Ehrenb. 1832; Ralfs, Brit. Desm. 1848, p. 175, t. 30. fig. 3. 
Forma aNneustior, Gutw. in Rozpraw. Wydz. matem.-przyr. Akad. Umiej. Krakow, 
xxxiii. 1896, p. 42, t. 6. fig. 93. 
Long. 232 4; lat. 13°54; lat. apic. 3:5 p. 
Hab. Pool in glen by roadside, near Bandarawella (altit. 4000-5000 ft.). 
69. CLosrERIUM kret, Bréb. in Mém. Soc. Sci. Nat. Cherbourg, iv. 1856, p. 156. 
t. ii. fig. 40. 
Var. virtatuM, Nordst. in Botaniska Notiser, 1887, p. 163; in K. Sv. Vet.-Akad. 
Handl. xxii. 1888, no. 8, p. 70, t. 3. fig. 20. 
Forma duplo-minor. Long 236,4; lat. 9&4. (Pl. 18. fig. 21.) 
Hab. Paddyfields, Heneratgodha. 
70. CLOSTERIUM SETACEUM, Ehrenb. 1834; Ralfs, Brit. Desm. 1848, p. 176, t. 30. 
fig. 4. 
Hab. With the preceding species. 
71. CLosrERIUM MONILIFERUM, Ehrenb. 1838; Ralfs, J. c. p. 166, t. 28. fig. 3. 
Hab. On rocks and among Podostemons, Mahawelli Ganga, near Peradeniya. 
72. CLOSTERIUM LErBLEINII, Kuetz. in Linnza, viii. 1833, p. 596, t. 18. fig. 79; Ralfs, 
l. c. p. 167, t. 28. fig. A 
Lat. 17 4; apicibus 107 a inter se distantibus. 
Hab. Paddyfield between Kosgoda and Urahaighasmahendai. 
73. CLOSTERIUM PLEURODERMATUM, sp. n. (Pl. 18. fig. 12.) C. subparvum, cellulis ` 
diametro circiter 7-plo longioribus, curvatis, dorso arcuato, ventre in medio leviter 
tumido, attenuatis polos versus, polis oblique rotundatis; membrana lutea (vel 
fuscescente) costata, costis visis 9. 
Lat. 22 p ; apicibus inter se distantibus 138-142 1. 
Hab. Paddyfields, Heneratgodha. Stream, Victoria Park, Colombo. 
In outward form this plant somewhat resembles C. Leibleinii, Kuetz. but the 
obliquely rounded apices and the costate cell-wall are quite distinctive. 
74. CLOSTERIUM SUBPORRECTUM, sp. n. (Pl. 18. figs. 14-16.) C. subparvum, vaide 
arcuatum ; cellulis angustis, sensim attenuatis polos versus, polis angustis obtusis ; 
membrana rufescente, valde costata, costis visis 4. 
Lat. 11°5-12°5 u; apicibus 125-180 » inter se distantibus. 
Hab. Paddyfields, Heneratgodha. 
SECOND SERIES.— BOTANY, VOL. VI. x 
