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THE FRESHWATER ALGÆ OF CEYLON. 171 
195. CosMaRIUM AMcNUM, Bréb. in Ralfs, Brit. Desm. 1848, p. 102, t. 17. fig. 3. 
Hab. Paddyfield between Kosgoda and Urahaighasmahendai. 
196. CoSMARIUM TESSELLATUM, Nordst. in Act. Univ. Lund. xvi. 1880, p. 7. Dis- 
phinctium tessellatum, Delponte, in Mem. Accad. Sci. Torino, ser. 2, xxx. 1878, p. 136, 
t. 21. figs. 10-13. 
Long. 105 u; lat. 60 u; lat. isthm. 46 u. 
Hab. With the preceding species. 
197. CosMARIUM QUADRIFARIUM, Lund. in Act. R. Soc. Scient. Upsala, ser. 3, viii. 1871, 
p. 32, t. 3. fig. 12. 
Forma minor: long. 3405-37 »; lat. 23-26 u ; lat. isthm. 5:2-6 u; crass. 15-17 u. 
Hab. With the preceding species. 
198. CosMARIUM BINUM, Nordst. in Wittr. & Nordst. Alg. Exsic. 1880, no. 383, ex De 
Toni, Syll. Alg. i. 0993. Forma cellulis 11-12-plo longioribus, semicellulis variabilibus 
in ambitu sed apicibus semper late truncatis. 
Long. 41-61 u; lat. 30-44 u; lat. isthm. 12-17 pn. 
Hab. Surface of pond, Royal Botanical Gardens, Peradeniya. Paddyfields, Henerat- 
godha. Paddyfield between Kosgoda and Urahaighasmahendai. Among Spirogyra sp., 
in little muddy backwaters, Mahawelli Ganga. Pool in glen by roadside, near Bandara- 
wella (altit. 4000-5000 ft.). Muddy bottom of pool at foot of Hakgala Rock (altit. 
6000 ft.). 
199. CoSMARIUM HAABOLIENSE, Wille, in Christiania Vid.-Selsk. Forhandl. 1880, no. 11, 
p. 25, t. 1. fig. 6. 
Var. PRoTRACTUM, West & G. S. West, in Trans. Linn. Soc., ser. 2, Bot. v. 1895, p. 65, 
t. 7. fig. 13. 
Long. 22 x; lat. 20»; lat. isthm. 6 x; crass. 12 p. 
Hab. Pond, Victoria Park, Colombo. 
200. COSMARIUM PTEROPHORUM, sp. n. (Pl. 21. figs. 6, 7.) C. minutissimum, paullo 
latius quam longum, profundissime constrictum, sinu aeutangulo subaperto; semi- 
cellule oblongo-elliptieze, granulis minutissimis paucis instructze, in centro papilla 
magna preeditz ; a vertice visæ anguste elliptieze, in medio utrobique cum papilla 
acuta et elongata; a latere visee globose, cum papilla magna acuta et introrsum 
geniculata utrobique semicellularum. 
Long. 9:5-11 4; lat. 10-12 4; lat. isthm. 2:0-2:8 p; crass. sine papill 5:5 », cum 
papill, 12 y. 
Hab. Paddyfields, Heneratgodha. 
This species can be compared with C. spyridion, West & G. S. West. 
SECOND SERIES.—BOTANY, VOL. VI. 27 
