168 MESSRS. W. WEST AND G. S. WEST ON 
Var. ELLIPSOIDEUM, var. n. (Pl. 20. figs. 43-45.) Var. major, constrictione paullo pro- 
fundiore, apicibus sspe leviter depressis, a vertice visis late ellipticis; chroma- 
tophoris ut in forma typica. 
Long. 56-63:5 u; lat. 38:5-45 u; lat. isthm. 32°5-38°5 u; crass. 36 y. 
Hab. Paddyfields, Heneratgodha ; and also between Kosgoda and Urahaighasmahendai. 
Pool in glen by roadside near Bandarawella (altit. 4000-5000 ft.). 
Numerous examples of this variety were observed, and although the depth of the 
constriction varied considerably, yet all were more constricted than the typical plant. 
The vertical view was also broadly elliptical and not circular. 
It agrees very well with Wolle's figure of Cosmarium connatum, var. minor (Wolle, Desm. 
U.S. t. 17. fig. 10), which is most probably a form of C. pseudoconnatum. Wolle appears 
to have been very confused in his ideas of C. connatum and C. pseudoconnatum. 
From C. pseudoconnatum, var. constrictum, West (in Journ. Linn. Soc., Bot. xxix. 
p. 161, t. 21. fig. 17), it is distinguished by the less deep and differently-formed sinus, 
and by the different form of the semicells, as well as by the elliptical vertical view. 
182. CosMARIUM PARVULUM, Bréb. in Mém. Soc. Sci. Nat. Cherbourg, iv. 1856, p. 133, 
t. 1. fig. 18. C. obcuneatum, West, in Journ. Linn. Soc., Bot. xxix. 1892, p. 162, 
t. 21. fig. 18. 
Forma wINOR. 
Long. 22 »; lat. 1075 u; lat. isthm. 7:8 p. 
Hab. Paddyfields, Heneratgodha. 
183. CosMARIUM TRACHYPOLUM, West & G. S. West, in Journ. Linn. Soc., Bot. xxxiii. 
1897, p. 166, t. 8. figs. 14, 15. 
Var. ELONGATUM, var. n. (Pl.20.figs. 39,40.) Var. semicellulis elongatis et subconicis, 
polis rotundatis. 
Long. 36-44 w; lat. 16-175 w; lat. isthm. 1475-16 p. 
Hab. Paddyfields, Heneratgodha. Paddyfield between Kosgoda and Urahaighas- 
mahendai. 
184. CosMARIUM DORSOGRANULATUM, sp. n. (Pl.20.fig. 41.) C. parvum, duplo longius 
quam latum, profunde constrictum, sinu angusto-lineari extremo ampliato ; semi- 
cellulae semioblongze, angulis basalibus rectangularibus et levissime rotundatis, 
lateribus rectis subparallelis, apicibus valde convexis, granulis minutis irregulariter 
dispositis, in parte superiore preedite, in parte inferiore glabra; a vertice vise 
ellipticee ; a latere vise oblongze, angulis subrectangularibus ; pyrenoidibus binis. 
Long. 32 p; lat. 15 »; lat. isthm. 5:2 4; crass. 1274 y. 
Hab. Paddyfields, Heneratgodha. 
185. COSMARIUM INCISUM, Josh. in Journ. Linn. Soc. Bot. xxi. 1886, p. 648, t. 24. 
figs. 28, 29. 
Forma. 
