bo 
bo 
F. E. FRITSCH. 
17. CHROOCOCCUS MINOR. 
Chroococcus minor (Kiitz.) Niig., op. cit., p. 47, Tab. I., fig. A4; Rabenhorst, op. cit., p. 30. 
Hab.—Gap pond, Winter Harbour, December 15th, 1903 (on Phormidium). 
18. CHROOCOCCUS HELVETICUS. 
Chroococcus helveticus Niig., op. cit. p. 46, Tab. L., fig. A3 ; Rabenhorst, op. cit., p. 31. 
Diam: cell. 5). 
Hab.—Gap pond, Winter Harbour, December 15th, 1903 (on Phormidium). 
Very typical colonies of exactly spherical cells ; colonies composed of 4—8-16 cells. 
Genus Dacryxococcorsis Hansg. 
19. DacrYLOcoccoPIS RHAPHIDIOIDES. 
(PL Wl tigs. 1165 1.172) 
Dactylococcopsis rhaphidioides Hansg., Prodr. d. Algenfl. v. Bohmen, ii. (1892), p. 139, fig. 49a. 
Diam. cell. in media parte = 2-3 w; long. cell. = 25-27 p. 
Hab.—¥ reshwater pond upon ice among eskers, four miles north of Black Island, 
MeMurdo Strait, September 12th, 1902. 
The individuals were slightly longer than those described by Hansgire, and were 
all of semilunar shape; the contents were pale blue-green, with a few small granules, 
and pronouncedly vacuolar ; the ends of the cells were pointed and colourless. Some 
of the cells showed a distinct septum across their middle. 
20. DACTYLOCOCCOPSIS ANTARCTICA Sp. 0. 
(PL IL, figs. 121, 122.) 
Cellulis minutis, numerosis in muco hyalino nidulantibus, stratum planum in 
superficiem algarum Cyanophycearum formantibus; cellulis irregulariter dispositis, 
fusiformibus vel in alterutro fine rotundatis, rarius leniter curvatis, contentu dilute 
‘erugineo cum granulis paucis, membrana tenui; propagatio divisione paulo 
obliqua fit. 
Diam. cell. = 15-2 »; long. cell. = 4-6 p. 
Hab.—¥orming an extensive flat stratum on the surface of the thallus of 
Nostoe commune, Granite Harbour, New Bay, January 20th, 1902. 
The cells of this minute species are in the majority of cases spindle-shaped ; in 
oceasional cells however one end is rounded or one side may be almost flat. Curved 
cells are rare. The ends of the cells are not protruded in any way and are 
not colourless. 
