190 MESSRS. W. WEST AND G. S. WEST ON 
Staurastrum bicoronatum, L. N. Johnson, is an allied species, but S. eyclacanthum is 
readily distinguished from it. 
Another allied species is S. Manfeldtii, Delponte, which, however, is larger, and does 
not possess the binodose lateral margins, nor the apical ring of six trispinate warts ; 
neither is it so broad in proportion to its length. The vertical view of S. Wansfeldtii 
has also a relatively much larger body. 
S. cyclacanthum can also be compared with three Indian forms figured by Turner (in 
K. Sv. Vet.-Akad. Handl. xxv. 1898, no. 5) as S. curvatum, W. B. Turn. (l. c. p. 128, 
t. 16. fig. 9; since changed to S. involutum, W. B. Turn., cf. Naturalist, Nov. 1893, 
p. 347), S. Manfeldtii, Delponte, var. bispinatum, W. B. Turn. (l. c. t. 16. figs. 11, 12), and 
S. burmense, W. B. Turn. (7. c. t. 16. fig. 13). We think these three should all be placed 
as forms of S. Manfeldtii, Delponte, and they differ considerably from S. cyclacanthum, 
especially in vertical view. 
S. Pseudosebaldi, Wille, is a somewhat similar species, but the nature and arrange- 
ment of the spines are totally different. Compare also with S. galeatum, W. B. Turn. 
262. STAURASTRUM BICORONATUM, L. N. Johns. in Bull. Torr. Bot. Club, xxi. 1894, 
p. 290, t. 211. fig. 9. 
Hab. Paddyfields, Heneratgodha.  Paddyfield between Kosgoda and Urahaighasma- 
hendai. 
269. STAURASTRUM GALEATUM, W. B. Turn. Z. c. 1898, p. 122, t. 14. figs. 3, 9, 10. S. sub- 
protractum, Schmidle, in Engler's Bot. Jahrbüch. xxvi. 1898, p. 55, t. 4. fig. 3. 
Long. 28:5 u; lat. cum proc. 42 u; lat. isthm. 7-5 u. (Pl. 22. fig. 19.) 
Hab. Paddyfields, Heneratgodha. 
Turner's figures are a very bad representation of this species, especially the vertical 
view. It would appear from his drawings that it is hardly distinguishable from 
S. saltans, Joshua, whereas in reality it but little resembles that species. S. subpro- 
tractum, Schmidle, seems to us to be very near if not identical with this species, but 
Schmidle’s figure is not good and lacks detail. The processes of S. galeatum are rougher 
on the upper than on the lower margin, a fact which was quite overlooked by Turner, 
although indicated by Schmidle in his figure of S. swbhprotractum. Our specimens 
also possessed a small tooth at the base of the underside of the processes, which is 
unrepresented in the figures of either Turner or Schmidle. We feel sure that Schmidle’s 
S. subprotractum is the same species as the plant we have found from Ceylon, and we 
are also certain that our plant is the same as that described by Turner as S. galeatum. 
264. STAURASTRUM LONGIRADIATUM, West & G. S. West, in Trans. Linn. Soc., ser. 2, - 
Bot. v. 1896, p. 267, t. 17. fig. 28. 
Hab. In artificial tank, Peradeniya. 
265. STAURASTRUM GRACILE, Ralfs, 1845; Brit. Desm. 1848, p. 136, t. 22. fig. 12. 
Long. 27 u; lat. cum proc. 44; lat. isthm. 5'5 p. 
Hab. In running water, Royal Botanical Gardens, Peradeniya. 
