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var/? Nyströmii Grun. (Cl. & M. Diat. No 172) Greenl.
(Davis Strait), not known to me.
Sectio; Spathulatce.
N. angularis W. Sm. (Van Heurck Syn. Pl. LXII, fig. 11
14) Greenl., Finm., Kara (Matotschkin), Cape Deschnew (East
Cape).
var. borealis Grun. (A. Diat. pag. 89, Pl. V, fig. 99) Finm., Kara.
var. kariana Grun. (1. c. p. 89, fig. 100) Kara.
N. spathidata Bréb. (Van Heurck Syn. Pl. LXII, fig. 7—8)
Greenl. (Davis Strait), Finm.
var. hyalina Greg. (Van Heurck S}Tn. 1. c. f. 9) Kara.
Sectio: Sigmoidece.
N. macilenta Greg. — In the Diat, of the A. S. I have
indicated this species as occurring near Spitsbergen, but, not
having met this species again, I think it may be a mistake.
N. Brebissonii var. borealis Grun. (Cl. & M. Diat. 310—318)
Strice 14—16 in 0,oi mm. Cape Wankarema..
Sectio: Sigmata.
N. Sigma Sm. (Ampliiplear a rigida Cl. I). of the A. Sea pag.
26. Amphipleura sigmoidea W. Sm.) Greenl., Finm., Spitsb.
N. (Sigma var.?) scabra Cl. — Valve large, in length 0,n
0.2 mm. breadth 0,oi mm., slightly sigmoid, or almost straight,
Iveel eccentric. Puncta about 4 in 0,oi mm. Striae not seen,
but the surface of the valve is covered bv scattered puncta,
which give it a shagreen-like appearance. — Pl. 38, fig. 73
a. b. — Cape Wankarema.
N. I cevis sima Grun. Mpt, — Greenl. (Discovery Bay), F. J. L.,
Cape Wankarema.
Sectio: Obtuscv.
N. (obtusa var.??) Iryophila Cl. Linear, slightly sigmoid
toward the ends. Puncta 8, absent in the middle, where tliere
is a small central nodule. Strire 20 in 0,oi mm., composed
of puncta. Length 0,i4 mm. Breadth 0,oo6 mm. —Pl. 38, fig.
74. — Cape Wankarema.
Sectio: Lineares.
N. gelida Cl. & Grun. Straight with cuneate ends. Keel
tolerably eccentric. Carinal puncta 6—8 in 0,oi mm., distant
in the middle, where tliere is a distinet central nodule. Stria)
composed of somewliat elongate puncta, which forni irregularly
wavy lines, 20—24 in 0,oi mm. Length 0,i4 mm. Breadth
0,oi2 mm. — Pl. 38, fig. 70. — Cape Wankarema.
N. (recta var.?) potaris Grun. —Valve tolerably eccentric,
linear with obtuse ends. Carinal puncta 7 in 0,or mm., distant
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