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Sect i o; EUipt icce.
K Utfor al is Donk. (A. Schm. Atl. Pl. VIII, tig. 23—25)
Greenl. (Mushroom Point) Finm., Kara, Cape Deschnew (East
Cape).
N. Smithii Bréb. (A. Schm. Atl. Pl. VII, tig. 14—22) Greenl.
(Mushroom Point) Finm., Spitsb., Kara (Matotschkin, Jalmal),
Cape Deschnew (East Cape).
N. fusca Greg. (A. Schm. Atl. Pl. VII, tig. 1—4) Finm.r
Matotschkin Schar.
.A7. cestiva Donk. (A. Schm. Atl. VIII, tig. 20) Finm., Cape
Wankarema.
N. suborbicularis Greg. (A. Schm. Atl. Pl. VIII, tig. 2—5)
Greenl. (Davis strait).
N. Eudoxia A. Schm. (Atl. Pl. VIII, fig. 40) Cape Wankarema.
V. Tschukt sehor um Cl. N. Sp. — Small, oval with rounded
ends. The middle of the valve has, as in N. Lyra-section,
two arcuate, convergent thickenings, connected by a
transverse bar at the centre. The space between the margin and
the thickenings has coarse, costate striae, 13 inO,oi mm. Length
0,oi mm. Br. 0,ooc5. — Pl. 37,fig. 48. — Cape Deschnew (East Cape).
This species comes nearest to N. Reichardii Grun. (Van
Heurck Syn. Pl. X, fig. 9) which is larger and lias closer,
punctate striae. The N. 31a t rf er i R, J. Brun (Diat. des Alpes et
du Jura Pl. I, fig. 18) is also an allied form, but more nearly
related to N. Borussica Cl. (Schr. phys. oek. Ges. zu Königs-
Domblitten deposit,
Sectio: Lyrce.
N. pyymcea Kiitz. (A. Schm. N. Sea Diat. Pl. I, fig. 43)
Finm., Spitsb., Kara, Cape Deschnew’ (East Cape).
N. abrupta Greg. (A. Sclim. 1. c. Pl. I, fig. 37) Finm., Spitsb.
N. hyalina Donk. (Brit, Diat. Pl. I, fig. 1) Finm.
N. forcipata Grev. (A. Schm. N. Sea Diat. Pl. I, fig. 45, Pl.
II, tig. IG & 18) Greenl. (Davis strait).
N. spectabilis Greg. (Diat. of Cl. pag. 481, Pl. IX, fig. 10)
Greenl.
V. circumsecta Grun. (A. Schtn. Atl. Pl. III, fig. 27—28) Finm.
N. Hennedyi Sm. (A. Schm. N. Sea Diat. Pl. I, fig. 41)
Greenl., Finm., Spitsb., Kara (Matotschkin).
y. Lyra Ehb. (A. Schm. Atl. Pl. II, fig. 16) Greenl., Finm.,
Spitsb., Kara (Matotschkin).
var. elliptica A. Sclim. (N. Sea Diat. Pl. I, fig. 38—39)
Greenl. (Mushroom Point), Finm., Kara,
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