136 MESSRS. W. WEST AND G. S. WEST ON 
Var. INTERMEDIUM, Roy & Biss. in Ann. Scot. Nat. Hist. 1894, p. 252. 
Long. 132 u; lat. 21 p. 
Hab. Paddyfield between Kosgoda and Urahaighasmahendai. 
55. PENIUM SPIROSTRIOLATUM, Barker, in Quart. Journ. Mier, Sci., New Ser. ix. 1869, 
p. 194; G. S. West, in Journ. Linn. Soc., Bot. xxvii. 1899, pp. 377-380, t. 8. 
figs. 1-12. Closterium spiraliferum, Jacobs. in Botan. Tidsskrift, Kjóbenhavn, 
1875, p. 177, t. 7. fig. S. Penium Haynaldii, Schaarschm. in Magyar Tudom. Akad. 
math. és 'Természettud. Közlemények, xviii. 1883, p. 277, t. 1. fig. 20. P. Royanum, 
W. B. Turn.; P. scandinavicum, W. B. Turn. in K. Sv. Vet.-Akad. Handl. xxv. 
1893, no. 5, pp. 165, 166, t. 23. figs. 3-7. 
Hab. Paddyfields, Heneratgodha. Paddyfield between Kosgoda and Urahaighasma- 
hendai. 
56. PENIUM SPIROSTRIOLATIFORME, sp. n. (Pl. 18. fig. 6.) P. mediocre, elongatum, 
rectum (vel subrectum), cylindricum, cellulis diametro 34-plo longioribus, margini- 
bus lateralibus parallelis, levissime attenuatis prope apices, apicibus dilatatis rotundo- 
truncatis; membrana luteola, valde spirostriatis; suturis variabilibus (circ. 10) 
irregulariter dispositis. 
Long. 264 n; lat. 7:5 H. 
Hab. Paddyfields, Heneratgodha. 
This extraordinary plant bears a considerable resemblance to P. spirostriolatum, 
Barker, but it is at once distinguished by its narrow form, its proportionately great 
length and uniform breadth. Division can take place at any part of the cell, this being 
shown by the variable number of transverse sutures, in all respects similar to those of 
P. spirostriolatum. The apices of the cells are markedly dilated, and no traces of a 
network were seen, such as is often present at or near the apices of P. spirostriolatwm. 
It might also be compared with some of the spirally-marked forms of Closterium 
angustatum, from which, however, it is readily distinguished. 
It is undoubtedly a true species of Penium of the same nature as P. spirostriolatum. 
57. PENIUM MINUTUM, Cleve, in Ofvers. K. Vet.-Akad. Fórh. 1863, no. 10, p. 493. 
Docidium minutum, Ralfs, Brit. Desm. p. 158, t. 26. fig. 5. 
Hab. Paddyfields, Heneratgodha. Paddyfield between Kosgoda and Urahaighasma- 
hendai. 
Var. GRACILE, Wille, in Christian. Forh. Vidensk.-Selsk. 1880, no. 11, p. 51, t. 2. fig. 93. 
Hab. Paddyfields, Heneratgodha. 
Var. ELONGATUM, nob. Docidium elongatum, West, in Journ. Roy. Mier, Soc. 1890, 
p. 284, t. 5. fig. 17. 
Long. 257 p; lat. Sp. (Pl. 18. fig. 7.) 
Hab. With the preceding variety. 
E RES E e E CAPE reu 
