464 CLEVE, DIATOMS. 
var. minor Grun. (A. Diat. pag. 28, Pl. I, fig. 12) Finm. 
N. cruciformis Donk. (Brit. Diat. P1. X, fig. 4) Finm. 
var. brevior Cl. — Length 0,035 mm. Br. 0,009 mm. Str. 14 
in 0,01 mm. Cape Deschnew (East Cape). — P1. 35, fig. 18. 
+ Theeliz Cl. (A. Diat. pag.' 18, Pl. I, fig. 22) Kara, Cape 
Deschnew (East Cape). Specimens from Cape Deschnew (East 
Cape) have the length 0,05 mm. and the br. 0,018 mm. Strix 
12 in 0,01 mm. In the Cape Deschnew (East Cape) material 
occur some specimens, which seem to connect N. Théelii 
with N. Pinnularia. 
N. decurrens (Ehb.) Grun. In the Cape Deschnew (East Cape) 
gathering occurs a Navicula, which Grunow refers to N. decur- 
rens. It has about 11 costate and radiant strizge in 0,01 mm., 
which do not reach the median line. Length 0,06 mir. Breadth 
0,013 mm. The valve is linear with gibbous middle and rounded 
obtuse ends. Median line is slightly undulating. In some 
specimens the strix are absent in the middle of the valve, in 
which case the form seems to be closely allied with Nav. cru- 
ciformis although the latter has the strige reaching to the me- 
dian line. On the other side it seems also akin to Nav. bica- 
pitata Ldt. — P1. 36, fig. 20. 
N. globiceps var. crassior Grun. (A. Diat. pag. 27, P1. I, fig. 
13) Kara (fresh-water species?). 
N. megastauros Cl. — Small, elliptic, probably depressed in 
the middle. Strix costate, oblique, reaching the median line, 
except in the middle, where they are very short or marginal, 
so that the central nodule is surrounded by a large stauros. 
Strie 16 in 0,01 mm. Length 0,02 mm. Breadtb 0,008 mm. 
Cape Deschnew (East Cape). — PI. 36, fig. 19. 
Sectio: Limose. 
N. ventricosa (Ehb.?) Donk var. subundulata Grumn. (A. Diat. 
pag. 29, P1: I, fig. 16), Kara. 
var. Kjellmaniana C1. (A. Diat. pag. 29, Pl. I, fig. 17) Finm. 
N. subventricosa Grun. (A. Diat. pag. 29, Pl. I, fig. 19) Kara. 
N. liber W. Sm. (A. 8. Atl. Pl L, fig16—18) Greenl., 
Spitsb., Finm. 
var. elongata Grun. (N. elongata Grun. A. S. Atl. Pl L, 
fig. 27—29). 
N. Scopulorum Bréb.— Cape Deschnew (East Cape); a large spe- 
cimen, 0,17 mm. in length, 0,01 mm. in breadth; strize 23 in 0,01 mm. 
Sectio: Quadriseriate. 
N. subdivisa Grun. (A. Diat. pag. 29, P1. I, fig. 20) Greenl., 
Mushroom Point, Kara, Cape Deschnew (East Cape). 
