THE FRESHWATER ALGJE OF CEYLON. 165 
162. CosMARIUM PYGM)EUM, Arch. in Quart. Journ. Mier. Sci. 1864, p. 174, t. 6. 
figs. 45—49; West, in Journ. Linn. Soc., Bot. xxix. p. 146, t. 20. fig. 24. 
Var. SCHLIEPHACKIANUM, West & G. 8S. West, in Journ. Linn. Soc., Bot. xxxiii. 1898, 
p. 302. 
Long. 9 p; lat. 9 w; lat. isthm. 2:3 mM; crass. 5'5 u. 
Hab. Paddyfields, Heneratgodha. 
163. CosMARIUM BIREME, Nordst. in Vidensk. Medd. naturh. Foren. Kjébenhayn, 1869, 
nos. 14-15, p. 212, t. 3. fig. 33. 
Long. 13:5 i; lat. 14°5 p; lat. isthm. 2°5 w; crass. 18 w. (Pl. 20. fig. 30.) 
Hab. With the preceding species. 
164. COSMARIUM BIPAXILLUM, sp. n. (Pl.20.fig. 31.) C. minutissimum, 11-plo latius 
quam longum, profunde constrictum, sinu lineari extremo subampliato; semi- 
cellule depresso-subsemicireulares, angulis basalibus rotundatis, apicibus levissime 
truncatis et emarginatis, supra et juxta isthmum (ad basin semicellularum) cum 
. granulo magno; a vertice vise anguste ellipticæ, granulo magno ad medium 
utrobique; a latere vise subcirculares, cum granulo magno prope isthmum 
utrobique. 
Long. 12:5 p; lat. 15 w; lat. isthm. 5'5 p; crass. 75 p. 
Hab. Paddyfields, Heneratgodha. 
This species can be compared with C. bireme, Nordst., from which it differs in the 
form of the semicells, and in the position, size, length, and direction ot the central 
projection. In C. bipaxillwm the central projection is granuliform, more basal in position, 
and is directed towards the isthmus. 
It may also be compared with C. Onychonema, Racib. 
165. CosMARIUM REGNELLII, Wille, in Bih. K. Sv. Vet.-Akad. Handl. 1884, viii. no. 18, 
p. 16, t. 1. fig. 34. 
Long. 16-22 u; lat. 14:5-19 »; lat. isthm. 37-48 u ; crass. 7:5-9:5 u. 
Hab. Yn artificial tank, Peradeniya. Paddyfield between Kosgoda and Urahaighas- 
mahendai. 
166. COSMARIUM SUBREINSCHII, Schmidle, in Flora, Ixxxii. 1896, Heft 2, p. 59, t. 7. 
fig. 24. 
Var. OCELLATUM, var. n. (Pl. 20. figs. 32, 33.) Var. semicellulis plus pyramidatis, 
apicibus convexo-truncatis, in centro tumore minore scrobiculum ferens. 
Long. 26-28:5 u; lat. 17-19 u; lat. isthm. 4-5 u; crass. 19'5 p. ; 
Hab. Paddyfields, Heneratgodha. ^ Paddyfield between Kosgoda and Urahaighas 
mahendai. 
167. CosMARIUM L&VE, Rabenh. Flor. Europ. Algar. iii. 1868, p. 161; G. S. West, in 
Journ. Linn. Soc., Bot. xxvii. 1899, p. 386, t. 10. figs. 1-6. 
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