FRESHWATER ALG. 11 
“Rondane” in Norway, where it was found on snow. The Antarctic individuals, like 
those described by Wille, lacked all traces of a pyrenoid. The nucleus (figs. 21-25) 
was prominent and situated in the centre of the cell, in which respect the specimens 
differed from those described by Wille (cf however, his fig. 25, where the nucleus 
appears to be quite central). Numerous discoid chloroplasts were frequently 
recognisable in the cells, and in some cases a slightly elongated stigma could be made 
out, not far from the bases of the cilia (figs. 21, 25). Some of the individuals were 
practically devoid of starch, while others contained a considerable amount. The cilia 
were so delicate that in some of the individuals it was only possible to trace them a 
very short way, but they appeared in general to be a little longer than the body of the 
eell (fig. 21). 
Some of the individuals were of a more elongated form than those described and 
figured by Wille (long. cell. = 13; lat. cell. = 6 p, figs. 23, 24), but in view of their 
resemblance to the type in other respects, I do not think that they belong to a different 
species. 
PROTOCOCCACE. 
Genus TRrocHiscra Kiitz. 
5. TROCHISCIA CRASSA. 
Trochiscia crassa Hansg., Physiol. und Algol. Mitteil. (1890), Tab. I.; Prodr. d. Algeafl. y. 
Bohmen, ii. (1892), pp. 240-241. ; 
Diam. cell. = 50-55 yw. Cell-wall deep brownish-red, opaque. 
Hab.—Granite Harbour, freshwater pond, January 20th, 1902. 
ULOTRICHACE. 
Genus Uorueix Kiitz. 
6. ULOTHRIX SUBTILIS var. VARIABILIS. 
Ulothriz subtilis Kiitz., Phycol. Germ. (1845), p. 197; Tab. Phycol. ii. (1852), Tab. 85, fie. 1. 
Var. variabilis (Kiitz.) Kirchner, Alg. Schlesien (1878), p. 77. 
Crass. fil. = 6-7 » ; cells one and a half times or twice as long as broad. 
Hab,—Freshwater pond in ice off “ Black Island,” MeMurdo Strait, December 31st, 
1902; Gap pond, Winter Harbour, December 15th, 1903 (in both cases on surface 
of Phormidium). 
This form was not common. 
