THE FRESHWATER ALG OF CEYLON. 205 
Genus SPIRULINA, Turpin. 
343. SPIRULINA PRINCEPS, sp. n.  Trichomata inter algas varias sparsa, in spirum laxi- 
usculum regularem diametro 11-12 4 regulariter contorta, anfractis inter se 9'5 u 
distantibus, zeruginosa et homogenea. 
Crass. trich. 4:5—5 u. 
Hab. Paddyfield between Kosgoda and Urahaighasmahendai. ; 
This fine Spirulina is considerably larger than any previously described species. The 
trichomes are relatively short, and very regularly twisted through about eighteen turns. 
Order CHROOCOCCOID E.£. 
Family CHROOCOCCACE E. 
Genus CHRoococcus, Naeg. 
344. CHRoococcts TuRGIDUS, Naeg. Gatt. einzell Alg. 1849, p. 46. Protococcus 
turgidus, Kuetz. Tab. Phye. i. p. 5, t. 6. 
Hab. Shallow pool, mangrove-swamp, Pandure. Paddyfields, Heneratgodha. 
Genus MERISMOPEDIA, Meyen. 
345. MERISMOPEDIA GLAUCA, Naeg. l. c. p. 55, t. 1D. fig. 1. Gonium glaucum, Ehrenb. 
Hab. Among Spirogyra sp. in fast-running stream, Peradeniya. Mouth of river, 
Pandure. Shallow pool, mangrove-swamp, Pandure. 
Genus Potycystis, Kuetz. 
346. Ponycystis RUGINOSA, Kuetz. Tab. Phyc. i. p. 7; Sp. Alg. p. 210. Clathrocystis 
eruginosa, Henfrey, in Micr. Journ. 1856, p. 53, t. 4. figs. 28-36; Rabenh. Flor. 
Europ. Algar. ii. p. 54. 
Hab. Often very abundant on the surface of pond, Royal Botanical Gardens, 
Peradeniya. 
Class BACILLARIEZ. 
Order RHAPHIDIEA. 
Family CYMBELLE. 
Genus CYMBELLA, Agh. 
347. CYMBELLA CUSPIDATA, Kuetz. Bacill. p. 79, t. 3. fig. 40. 
Hab. Muddy bottom of pool at foot of Hakgala Rock (altit. 6000 ft.). 
348. CYMBELLA CYMBIFORMIS, Bréb. Alg. Falaise, p. 49, t.7. Cocconema cymbiforme, 
Ehrenb. 
Hab. In stream, Peradeniya. Pond, Victoria Park, Colombo. Wet rocks, Kadaganuwa. 
2F2 
