THE FRESHWATER ALG® OF CEYLON. 197 
297. SCENEDESMUS DENTICULATUS, Lagerh. in Ofvers. af K. Vet.-Akad. Fórh. 1882, 
no. 2, p. 61, t. 2. figs. 13-10. 
Var. LINEARIS, Hansg. in Archiv Naturwiss. Landesdurehf. Böhm. vi. 1888, no. 6, 
p. 268. 
Hab. Stream, Victoria Park, Colombo. Paddyfield between Kosgoda and Urahaig- 
hasmahendai. Muddy bottom of pool at foot of Hakgala Rock (altit. 6000 ft.). In 
artificial tank, Peradeniya. 
298. SCENEDESMUS QUADRICAUDA, Bréb. Alg. Falaise, 1835, p. 66. Achnanthes quadri- 
cauda, 1828. Scenedesmus caudatus, Corda, 1838; Ralfs, Brit. Desm. p. 190, t. 31. 
figs. 12 a-g. 
Hab. Paddyfields, Heneratgodha. 
Var. ABUNDANS, Kirchn. Alg. Schles. p. 98. 
Hab. Muddy bottom of pool at foot of Hakgala Rock (altit. 6000 ft.). 
Var. Maximus, West & G. S. West, in Trans. Linn. Soc., ser. 2, Bot. v. 1895, p. 83, t. 5. 
figs. 9, 10. 
Long. cell. 29-80 p ; lat. cell. 9'5-11°5 y. 
Hab. In artificial tank, Peradeniya. 
Var. OPOLIENSIS. (Scenedesmus opoliensis, P. Richter, 1895; Phycotheca Universalis, 
no. 686.) 
Long. cell. 13-20 » ; lat. cell. 5-577 w. (Pl. 17. figs. 16, 17.) 
Hab. Paddyfields, Heneratgodha. 
The number of small denticulations at the poles of the cells varied from one to three, 
and they were present on all the cells of the ecenobium. 
Genus RHAPHIDIUM, Kuetz. 
299. RHAPHIDIUM POLYMORPHUM, Fresen.; Rabenh. Flor. Europ. Algar. iii. p. 44. 
Var. FALCATUM, Rabenh. Flor. Europ. Algar. iii. p. 45. Mierasterias falcata, Corda, 
1835. 
Hab. Paddyfields, Heneratgodha. ` Paddyfield between Kosgoda and Urahaighas- 
mahendai. 
Var. ACICULARE, Rabenh. Je p. 45. Rhaphidium aciculare, A. Br. Ankistrodesmus 
acutissimus, Arch. ah 
Hab. Paddyfield between Kosgoda and Urahaighasmahendai. In artificial tank, 
Peradeniya. 
Var. TURNERI, nob. Rhaphidium ? spirale, W. B. Turn. in K. Sv. Vet.-Akad. Handl. 
xxv. 1893, no. 5, p. 156, t. 20. fig. 26. 
Crass. cell. 1:8-2 p. (Pl. 17, fig. 18.) 
Hab. Paddyfields, Heneratgodha. 2 
E 
