— 163 — 
This species occured in small gelatinous masses amongst Spirogyra 
gracilis and S. neglecta in stagnant water in a riverbed. 
It is nearest to Cylindrocystis pyramidata West & G. 8. West recently 
found in Ceylon, but it is distinguished by its smaller size, its less tape- 
ring semicells, and its more open constriction. 
Penium Bréb. 
18. P. Digitus Bréb. in Ralfs Brit. Desm. p. 150, t. XXV, £3. Clo- 
sterium Digitus Ehrenb. Penium lameliosum Ktitz. P. navigium W. B. 
Turner. 
Long. 188 4; lat. 54 p. 
Among Utricularia in riverbed. 
Area: Ubiquitous. 
19. P. australe Racib. in Rospraw. Akad. Umiej. Krakow. Wydz. 
matem.-przy. ser. 2, vol. XXII, p. 367, t. VI, f.27; West & G.S. West in 
Journ. Linn. Soc. bot. XXXII, 1897, p.157, t. VIE, f. 16. 
Long. 80—75y; lat. 43—44y; lat. constrict. 41—42 uw. 
In stagnant water in the jungle and in muddy ricefields. 
Area: Singapore and Australia. 
20. FP. cucurbitinum Biss. in Journ. Roy. Micr. Soc. 1884, p. 197, 
t.V, f. 7. 
Forma minor West in Journ. Roy. Micr. Soc. 1894, p. 4. 
Long. 55,5 yw; lat. 52 py. 
In stagnant water with other Desmids. 
Area: Europe. New Zealand (var.). 
2{. P.curtum Bréb. in Kiitz. Spec. Algar. 1849, p. 167. Closterium 
curtum Bréb. 1840. Cosmarium curtum Ralfs 1848. 
Forma major Wille in Ofvers. af K. Vet.-Akad. Férh. 1879, no. 5, 
p. 56, t. XIV, f. 73. 
Long. 58; lat. 28 w. 
On rocks in riverbed, abundant amongst Cosmarium lave. 
Area: Europe, N. America, W. Indies, India, Madagascar, and W. Alrica. 
292. BP. Navicula Bréb. in Mém. Soc. Scient. Nat. Cherbourg, 1856, 
IV, p. 146, t. 41, f. 37. 
Long. 32,5 4; lat. 9,6 w. 
In stagnant water in the jungle. 
Area: Europe, N. America, W. Indies, India, Burmah, Ceylon, Singapore 
E. Indies, Sandwich Is., New Zealand and Australia. 
