THE FRESHWATER ALGJE OF CEYLON. 175 
Genus Paymartopocis, Nordst. 
215. PHYMATODOCIS IRREGULARE, Schmidle, in Engler's Bot. Jahrb. xxvi. 1898, Heft L 
p. 13, t. 1. figs. 3-9. 
Long. 24-29 u ; lat. 46-50 nu ; lat. isthm. 23-29 u. (PI. 22. figs. 32-34.) 
Hab. Paddyfields, Heneratgodha. 
In all the specimens we observed of this plant the lateral margins of the semicells were 
undulate, as in P. Nordstedtiana, Wolle, and in the vertical view the angles (both long 
and short) were also very slightly retuse at the apex, exactly as we found them in 
Wolle’s species (cf. Trans. Linn. Soc., ser. 2, Bot. v. 1895, t. 12. fig. 6 d). 
Genus SrAURASTRUM, Meyen; emend. Ralfs. 
216. SrAURASTRUM DEJECTUM, Bréb. in Menegh. Synops. Desm. 1840, p. 227.  Binatella 
dejecta, Bréb., 1835. 
Long. sine spin. 19-214; lat. sine spin. 185-22 4; long. spin. 5'2-5'84; lat. isthm. 
577—6 u. 
Hab. Paddyfields, Heneratgodha. 
217. STAURASTRUM CONNATUM, Roy & Biss. in Journ. Bot. xxiv. 1886, p. 237. S. dejectum, 
var. connatum, Lund. 
Long. sine spin. 254; lat. sine spin. 23 u; long. spin. circ. 9'5 u ; lat. isthm. 8'5 u. 
Hab.. With the preceding species. 
218. STAURASTRUM CUSPIDATUM, Bréb. in Menegh. Synops. Desm. 1840, p. 226; Ralfs, 
Brit. Desm. 1848, p. 122, t. 21. fig. 1. 
Forma rNcuRvA, Hiemer, in Verhand. der k. k. zool.-bot. Ges. Wien, 1891, p. 604, 
t. 5. fig. 19. 
Long. 18-21, ; lat. sine spin. 145-155 u; lat. isthm. 4°4 u. 
Hab. With the preceding species. 
219. STAURASTRUM UNICORNE, W. B. Turn. in K. Sv. Vet.-Akad. Handl. xxv. 1893, no. 5, 
= p. 107, t. 15. fig. 16. Distrib. Bengal; Central China. 
Var. ECORNE, nob. (S. ecorne, W. B. Turn. l. c. t. 15. fig. 17). Hab. Bengal. 
Var. EXIMIUM, nob. (S. eximium, W. B. Turn. l. c. p. 131, t. 17. fig. 6). Hab. Bengal. 
Var. NODIFERUM, nob. (S. nodiferum, W. B. Turn. l. c. p. 130, t. 14. fig. 26). Hab. Bengal. 
Var. oBEsUM, West & G. S. West, in Trans. Linn. Soc., ser. 2, Bot. v. 1896, p. 256, t. 16. 
fig. 12. Hab. U.S.A. 
The four plants described by Turner as S. wnicorne, S. ecorne, S. ezimium, and 
S. nodiferum appear to us to represent different types of ornamentation of one species, 
