SP Loe D ET ee Se YE oe 
THE FRESHWATER ALG OF CEYLON. 193 
273. ONYCHONEMA LIVE, Nordst. in Vidensk. Medd. naturh. Foren. Kjóbenhavn, 1869, 
no. 14, p. 206, t. 3. fig. 34. 
: id Paddyfields, Heneratgodha. Paddyfield between Kosgoda and Urahaighasma- 
endai. 
Genus SpH#rozosma, Corda. 
274. SPHJEROZOSMA GRANULATUM, Roy & Biss. in Journ. Bot. xxiv. 1886, p. 242, t. 268. 
fig. 7. 
Hab. Paddyfields, Heneratgodha. 
Var. PERGRANULATUM, var.n. (Pl. 22. fig. 28.) Var. semicellulis ellipticis (non oblongis) ; 
granulis numerosis, ad marginem lateralem unumquemque 3-4 et trans semicellulas 
8-10 subirregulariter dispositis. 
Long. 10:8-12 u; lat. 108-1154; lat. isthm. 45-5 n. 
Hab. With the typical form. 
Genus DESMIDIUM, Ag. 
275. DESMIDIUM Aprogonum, Bréb., 1836; Rabenh. Flor. Europ. Algar. iii. p. 154. 
Hab. Paddyfields, Heneratgodha. Paddyfield between Kosgoda and Urahaighasma- 
hendai. 
Var. TETRAGONUM. Aptogonum tetragonum, Delponte, in Mem. Accad. Sci. Torino. 
ser. 2, xxx. 1878, p. 75, t. 3. figs. 20-28. 
Hab. Paddyfield between Kosgoda and Urahaighasmahendai. 
This variety was a true tetragonal form of D. aptogonum, and the filaments were 
twisted exactly as in the type. It was a very different plant from tetragonal forms of 
D. Baileyi, which were seen abundantly from Ceylon. 
276. DEsMiDIUM Barinrevr, De Bary, Conjug. p. 70. <Aptogonum Baileyi, Ralfs, Brit. 
Desm. 1848, p. 208, t. 35. fig. 1. D. Baileyi, Nordst. in K. Sv. Vet.-Akad. Handl. 
xxviii. 1888, no. 8, p. 27, t. 2. figs. 4, 5. 
Long. 17-19; lat. 17-18 n. 
Hab. Paddyfields, Heneratgodha. 
All the specimens observed were tetragonal. 
277. DESMIDIUM PSEUDOSTREPTONEMA, sp. n. (Pl. 22. figs. 35-37.) D. mediocre, filis 
tortis, cum vagina mucosa; cellule subcompresse, 1j-2-plo latiores quam Jonge, 
profunde constrictze, sinu angusto ad extremum gradatim subampliato ; semicellulis 
transverse et anguste oblongis, lateribus rotundatis, apicibus subconvexis cum 
processibus connexis brevibus; a vertice vise triangulate (vel bilobatz), con- 
strictione parva infra angulum unumquemque, angulis rotundo-angulatis, lateribus 
levissime convexis vel rectis. 
Long. 17-21; lat. 31-35 4; lat. isthm. 13:5-19 4; lat. apic. 145-1575 p. 
Hab. Paddyfields, Heneratgodha. 
