THE FRESHWATER ALGJE OF CEYLON, 179 
spiny Staurastrum in being directed towards the angles. Most of the spines are bent at 
their base, and this curvature in the direction of the angles of the semicells is one of the 
most marked features of S. villosum. 
230. STAURASTRUM SUBLJEVISPINUM, West & G. S. West, in Journ. Linn. Soc, Bot. 
xxxiii. 1898, p. 314, t. 18. figs. 20-22. 
Forma tam longum quam latum (cum proc.), processibus paullo brevioribus et 
apicibus acutis minute incrassatis. Long. cum proc. 234; lat. cum proc. 244; lat. 
isthm. 6:5 n. 
Hab. With the preceding species. 
231. STAURASTRUM HENERATGODHENSE, sp. n. (Pl. 21. fig. 23.) S. subparvum, circiter 
tam longum quam latum, profunde constrictum; semicellule late transverse 
ellipticee, polis in processus breves crassos productis, apicibus processuum sub- 
truneatis bispinatisque, dorso convexo cum verrucis parvis bispinatis 4 ornato, ventre 
valde inflato eum dentieulo ad basin processuum intra sinum; a vertice vise 
subrhomboide:, polis productis et bispinatis, intra polo unoquoque eum verruca 
parva bispinata singula, medium semicellularum versus verrucis parvis bispinatis 2 
utrobique. 
Long. 32-33, ; lat. sine spin. 31-32:5 p, cum spin. 86; lat. isthm. 7°54; crass. 
19:5 H. 
Hab. Paddyfields, Heneratgodha. 
The arragement of the warts on the dorsal surface of this Staurastrum is best seen in 
vertical view. There are four double-spined warts, one pair on each side of the apex, and, 
in addition, a single somewhat smaller double-spined wart between each of these pairs 
and the end of the process. 
232. STAURASTRUM QUADRICORNUTUM, Roy & Biss. in Journ. Bot. xxiv. 1886, p. 210, 
t. 268. fig. 4. 
Var. PATENS, var. n. (Pl. 21. fig. 24.) Var. semicellulis depressis, apicibus latis subrectis, 
processibus subhorizontaliter dispositis. 
Long. 93,4; lat. sine proc. 14 u, cum proc. 29, ; lat. isthm. 5°3 u. 
Hab. With the preceding species. 
233. STAURASTRUM GEMELLIPARUM, Nordst. in Vidensk. Medd. f. d. naturh. Foren. 
Kjóbenhavn, 1869, p. 230, t. 4. fig. 54. 
Long. sine proc. 194, cum proc. 264; lat. sine proc. 13:4, cum proc. 23°5 n ; lat. 
isthm. 434. (Pl. 21. fig. 25.) 
Hab. With the preceding species. 
934. STAURASTRUM HaNTzscHII Reinsch, Spec. Alg. Fung. p. 129, t. 22 n. figs. 1, 4, 6. 
Var. concruum, West & G. S. West, in Traps. Linn. Soc., Bot. ser. 2, v. 1896, p. 257, 
Är 
SECOND SERIES.—BOTANY, VOL. VI. 2c 
