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A specimen from Cape Deschnew (East Cape) has 21 strise
in 0,oi mm. in the middle and 23 near the ends. Lenght 0,oss
mm. Br. 0,oos mm.
N. latefasciata Grun. (A. Diat. Pl. I, fig. 21) Greenl., Mush*
room Point, Kara, Cape Deschnew (East Cape).
Specimens from Cape Deschnew (East Cape) have not so
strongly interrupted strise as specimens from Kara.
N. grönlandica Cl. (K. Sv. Vet. Ak. Handl. 18 No 5, pag.
7, Pl. I, fig. 13) Davis strait.
Sectio: Pa Ipehra les.
N. palpébralis Bréb. var. Davis Strait. — Length 0,o45 mm.
Breadth O,oi3 mm. Strire 10 in 0,oi mm. costate, scarcely
punctate.
var. minor Grun. (A. Diat. pag. 30, Pl. I, fig. 23) Finm.
A variety from Spitsbergen has 16 strire inO,oi mm. Length
0,04 mm. Breadth 0,oos mm. N. minor Greg.
N. semiplena (Grev.) Donk (Brit. Diat. Pl. IV, fig. 5) Finm.,
Spitsb. (Length 0,og5 111111. Breadth 0,ooi 111111. Strise 10 in
0,oi 111111.).
N. solida Cl. (A. Diat. pag. 13, Pl. I, fig. 24) Finm.
Sectio: Amphisbcence.
N. brevis Greg. (Diat. of Cl. pag. 478, Pl. IX, fig. 4, A.
Schm. N. Sea Diat. Pl. II, fig. 15) Greenl., Davis Strait, Finm.,
Spitsb., Cape Deschnew (East Cape).
var. vexans Grun. (A. Schm. N. Sea Diat. Pl. II, fig. 14)
Finm., Matotschkin, Kara.
var. distoma Grun. (A. Diat. pag. 30, Pl. I fig. 25—26) Finm.
N. amphisbcena var. fuscata (Sclium) Grun. (A. Diat. pag.
31, Pl. I, 1ig. 27) Kar a.
N. subsalina Donk. (Brit. Diat. Pl. IV, fig. 2, N. Fenzlii
Grun. N. lacustris Grun.) Greenl., Spitsb., Finm.
Sectio: Radiosa.
N. flanatica Grun. has been indicated in Cl. Diat. of the A.
%S
S. pag. 17 as an arctic species. I have, however, not found
this species in reexamining my old slides, so there may be a
mistake in the determination.
N. Gastrum (Ehb.?) Donk. (Van Heurck Syn. Pl. VIII, fig.
25 and 27) Kara, Cape Deschnew (East Cape) (Fresh-water
species?).
var. jenisejensis Grun. (A. Diat. pag. 31, Pl. I, fig. 28)
Cape Deschnew (East Cape).
N. diffito-radiata Greg. (A. Schm. N. Sea Diat. Pl. III, fig.
4) Greenl., Mushroom Point, Finm., Spitsb., Kara.
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