THE FRESHWATER ALGJE OF CEYLON. 201 
Family SIROSIPHONIACE. 
Genus HAPALOSIPHON, Naeg. 
317. HAPALOSIPHON LUTEOLUS, West & G. S. West, in Journ. Bot. xxxv. 1897, p. 241. 
Crass. fil. 7-115 u; crass. cell. 55-7 u; long. heteroeyst. 76-14 4; lat. heterocyst. 
6-7:5 HA. 
Hab. Paddyfield between Kosgoda and Urahaighasmahendai. 
318. HAPALOSIPHON DELICATULUS, sp. n. H inter alias algas aquaticas sparsus, flavo- 
seruginosus, filis flexuosis, vaginis tenuissimis, achrois, valde aretis; ramis singulis 
distantibus et unilateralibus, filo primario in crassitudine similibus vel paullo 
angustioribus ; cellulis diametro 2—32-plo longioribus, iis ramorum spe longioribus 
(diametro 11-80-plo longioribus); heterocystis intercalaribus, oblongis, diametro 
duplo vel triplo longioribus ; sporis non visis. | 
Crass. fil. 3:8-4 u; crass. ram. 3°2-3'5 p; long. heterocyst. 7-12 4; lat. heterocyst. 
3-3'8 u. 
Hab, Paddyfields, Heneratgodha. 
The nearest species to this is H. intricatus, West, but the Ceylon species is much 
more delicate, has a distinct habit, and differs in several other characters. "The branches 
arise approximately at right angles to the primary filament, and the cell of the primary 
filament at the base of the branch always projects for some considerable distance into 
the delicate sheath of the latter. Some of the cells of the branches are very elongated 
and contain numerous small granules, but the cells of the primary filaments usually 
possess homogeneous cell-contents. 
Genus STIGONEMA, Ach, 
319. STIGONEMA OCELLATUM, Thur. in Ann. Sci. Nat. 6° sér., Bot. i. 1875, p. 380. 
Conferva ocellata, Dillw. Brit. Conf. p. 60. Sirosiphon ocellatus, Kuetz. 
Hab. Paddyfields, Heneratgodha. 
320. STIGONEMA PANNIFORME, Born. & Flah. in Ann. Sci. Nat. 7* série, Bot. v. 1887, 
p. 71. Scytonema panniforme, Agh., 1817. Strosiphon panniformis, Kuetz., 1843. 
Crass. fil. 25-29 y. E 
Hab. Forming tufts on stems of Osbeckia buxifolia on summit of Hakgala Rock 
(only in very exposed situations). 
Genus NosrocHoPsis, Wood. 
321. NOSTOCHOPSIS LOBATUS, Wood, in’ Proc. Amer. Phil. Soc. Philadelphia, 1869, 
p. 127; in Smithson. Contrib. Knowl. 1874, iii. p. 45, t. 3. fig. 6; Born. & Flah. 
