26 F. E. FRITSCH. 



laete terugiueo, homogeneo ; cellulis in familiis novellis minutissimis et dense 

 aggregatis, in familiis vetustis 1-1 5 ju, diam. et distincte diseretis ; cellularum divisio 

 fit in tres directiones alternantes. 



IIal>. Pond some distance behind hut, Cape Adare, January 9th, 1902 ; in fresh- 

 water ice under boulder, Cape Adare, January 9th, 1902. 



The genus Eucapsis was founded by Clements and Shautz (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 E. 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. 



OSCILLATORIACK&. 



Genus MICROCOLEUS Desmazieres. 

 29. MICROCOLEUS VAGINATUS. 



Microcoleus rat/inahts (Yauch.) Gomont, Monogr. d. Oscill., Ann. Sui. Nat., Bot., 7 ser., xv. (1892), 

 pp. 355-3i>7, PI. XIV., fig. 12. 



I faf>. Granite Harbour, January 20th, 1902 (rare). 



Genus SYMPLOCA Kiitz. 

 30. SYMPLOCA sp. 



Hal>: 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 /x high and composed of very narrow and closely placed 

 filaments. It may have been a specimen of S. f/it'nnnt!* (Kiitz.) Gom. 



Genus LYNGBYA C. Agardh. 

 31. LYNGBYA AESTUAUII. 



Lynglija ccsti/arii (Mertens) Liubm. ; Gomont, oji. cit., xvi. (1802), pp. 127-131, PL III., figs. 1 and 2. 



Diam. fil. = 8-15 /JL ; diam. trich. = 7-12 p. 



Hal). Gap pond, Winter Harbour, February 20th, 1904 ; dry ponds, Winter 

 Quarters, February, 1902. 



The sheath was thick, stratified and provided with a rough edge. 



