236 DR. Е. Е. FRITSCH ON FRESHWATER ALGA 
64. NavicuLa wUTICoPsIS, Van Heurck, Diatomées, Result. Voy. © Belgica? en 
1897-99, Anvers, 1909, р. 12, tab. 2. fig. 181. 
Samples 8, 9, 10, 11, and 15, common. Previously recorded from the 
Antarctie ( Van Heurck). 
Length of valve =24 ш; breadth (at widest point) =10u. In most of 
the individuals the sides of the valves were nearly parallel, but occasionally 
they were somewhat arched (text-fiv. 1, B) ; ends very pronouncedly swollen 
in a capitate manner. 
65. P NAVICULA LUCIDULA, Grun.; Van Heurck, Atlas, 1880-81, pl. 14. 
fig. 40. 
Sample 9, rather rare. 
Certainly a very close ally of this species. 
66, NavICULA MUTICA, А’. : Van Денге, Synopsis Dat. 1885, р. 95. 
pl. 10. fig. 17. 
Samples 8, 9, 10, 13, and 17, common. Previously recorded from the 
Antarctic (Reinsch, Holmboe). 
Length of valve =16 u; breadth =7-8 д. 
07. AMPHORA OVALIS, Айе, : Van Heurck, Synopsis Hiat, 1885, p. 59, pl. 1. 
fig. 1. 
Sample 4 (red snow !), isolated. The var. yracilis has previously been 
recorded from Kerguelen (Reinsch). 
68. GOMPHONEMA MONTANUM, Schum. ; Van Heurck, Synopsis Diat. 1885, 
р. 124, pl. 23. figs. 33 & 36. 
"ample 9; isolated specimens. 
3 
EXPLANATION OF THE PLATES. 
PLATE 10, 
Fig. 1. Protoderma Browni, V. V. Fritsch. A small portion of one of the sheets of cells 
formed by this species. ( X 830.) 
Figs. 2-6. Chlorosphera antarctica, F. E. Fritsch, Fig. 2. Large isolated cell with a wide 
mucilage-sheath and a quantity of fat in the cell-contents (x 540). Fig. 3. А 
group of small cells without mucilage-sheath ; fat equally diffused through the 
contents (x 1100). Figs. 4, 5. Oval cells with segregated masses of fat; possibly 
а stage in which the cells are preparing to divide (cf. p. 303) (х 830, 730, re- 
spectively). Tig. б. А cell in which the fat is very prominently developed 
( x 540). 
