THE FRESHWATER ALG OF CEYLON, 183 
241. SrAURAsTRUM TORSUM, W. B. Turn. in K. Sv. Vet.-Akad. Handl. xxv. 1893, no. 5, 
p. 115, t. 13. fig. 28. 
Long. 26:5 4; lat. sine proc. cire. 152, cum proc. 364; lat. isthm. 7 u. 
Hab. With the preceding species. 
The forms we have observed of this species are somewhat different from the figures 
given by Turner. The characters of this plant are so well-marked that, allowing for the 
similar misrepresentation of position and lack of detail shown in many of his deed 
figures, we feel sure that our plants are the same as those he describes as “ common ' 
Bengal. 
The three short processes on the lateral margins of each of the primary processes (two 
on the convex margin and one on the concave margin) were truncate and bidenticulate. 
The processes in front view. were subparallel and slightly divergent. The minute 
granules at the apex of the semicells are in five pairs, one pair within the margin between 
the bases of each of the five processes. 
242. STAURASTRUM ACANTHASTRUM, sp. n. (PI. 22. fig. 1.) S. mediocre, circiter 24-plo 
latius quam longum (cum processibus) modice constrictum; semicellule sub- 
globosæ, lateribus in processus longos horizontaliter dispositos productis, processus 
spinis brevibus irregulariter ordinatis instructis, apicibus processuum profunde 
trifurcatis, apicibus semicellularum convexis papilla conica ad basin processus 
uniuscujusque; a vertice visse O-radiatz, corpore parvo, processibus cum spinis 
brevibus distincte irregulariter ordinatis instruetis, cum annulo papillorum 6, papilla 
singula ad basin processus uniuscujusque. 
Long. 244; lat. sine proc. 14 4, cum proc. 634; lat. isthm. On, 
Hab. Paddyfields, Heneratgodha. 
This species belongs to a group which includes S. Rotula, Nordst., S. coronulatum, 
Wolle, and S. pentacladum, Wolle. From the two former it is distinguished by its 
smaller size, its relatively much smaller body, and by the curiously ornamented processes. 
From AS, pentacladum it is distinguished by its extraordinary processes and by the ring of 
conical papiilze at the apices of the semicells. 
We know of only one Staurastrum—viz., S. aspinosum, Wolle—which possesses spines 
irregularly disposed at intervals along its processes. 
249. STAURASTRUM CEYLANICUM, sp.n. (PI. 22. fig. 2.) S. parvum, circiter 1}-plo latius 
quam longum (cum processibus), modice constrictum ; semicellulæ late campanulatæ, 
apicibus leviter elevatis et convexis, angulis superioribus in processus breves glabros 
subhorizontaliter (vel leviter extrorsum) dispositos productis, apicibus processuum 
4-denticulatis, juxta et infra apicem processus uniuscujusque verruca elevata 
tridenticulata instructa; a vertice vise 5-6-gonæ, angulis in processus breves 
productis, lateribus. concavis, apicibus processuum subdivisis denticulatis, ad basin 
processuum utrobique denticulo instructæ. 
Long. 234; lat. eum proc. 285-31 p, sine proe. circ. 1154; 
. Hab. Paddyfields, Heneratzodha. 
lat. isthm. 4.5 He 
