26 ¥. E. FRITSCH. 
lacte serugineo, homogeneo; cellulis in familis novellis minutissimis et dense 
ageregatis, in familiis vetustis 1-1°5 ys diam. et distincte discretis; cellularum divisio 
fit in tres directiones alternantes. 
TTab.—Pond some distance behind hut, Cape Adare, January 9th, 1902; in fresh- 
water ice under boulder, Cape Adare, January 9th, 1902. 
The genus Lucapsis was founded by Clements and Shantz (Minnesota Bot. 
Studies, iv. (1909), p. 134) for a species of blue-green Alga forming cubical packets of 
cells in an alpine pond in Colorado. The Antarctic species differs from it in the much 
smaller dimensions of the cells, in their wider separation in the mature condition, and 
in the frequent irregularity of the colonies. The latter do not form the regular cubical 
groups figured by the authors for £. alpina, but are (especially the older ones) of 
irregular outline (fig. 47), although composed of individual packets of eight or more 
cells, which are quite regularly disposed. The investment is quite invisible in 
unstained material, but is rendered obvious by treatment with methylene blue ; it 
closely follows the outline of the colony. 
: OSCILLATORIACEAM. 
Genus Microcoteus Desmazitres. 
29. MiIcROCOLEUS VAGINATUS. 
Microcoleus vayinatus (Vauch.) Gomont, Monogr. d. Oscill., Ann. Sci. Nat., Bot., 7 sér., xv. (1892), 
pp. 855-357, Pl. XIV., fig. 12. 
Hab.—Granite Harbour, January 20th, 1902 (rare). 
Genus Symptoca Kiitz. 
30. SYMPLOCA sp. 
Hab.—On rocks, freshwater pond, Winter Harbour, January 12th, 1904. 
Only one specimen of this form was found and that proved insufficient for 
determination. It appeared in the shape of very minute dense deep blue-green 
tufts, not more than 30, high and composed of very narrow and closely placed 
filaments. It may have been a specimen of S. thermalis (Kiitz.) Gom. 
Genus Lynesya C. Agardh. 
31. LYNGBYA AESTUARII. 
Lyngbya estuarii (Mertens) Liebm. ; Gomont, op. cit., xvi. (1892), pp. 127-131, Pl. IIL, figs. 1 and 2. 
Diam. fil. = 8-15 »; diam. trich. = 7-12 p. 
Hab.—Gap pond, Winter Harbour, February 20th, 1904; dry ponds, Winter 
Quarters, February, 1902. 
The sheath was thick, stratified and provided with a rough edge. 
