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X. kryophila Cl. — Elliptic oblong or elliptic with parallel
sides. Strise coarse, costate, about 8 in 0,oi mm., interrupted
by large areas 011 both sides of the median line, o ver which
areas the faint continnations of the striee are visible. Length
o
0,05. Br. 0,oi8 mm. — Pl. 37, fig. 43. — Cape Wankarema.
N. (kryophila var.?) gelida Cl. — Elliptic. St r i re short,
marginal, 9 in 0,oi mm., costate, separated from very short strise
011 both sides of the median line by large areas, over which
traces of the striae are visible. Central nodule surrounded by
a circular area. Length 0,os mm. Breadth 0,o4 mm. — Pl. 37,
fig. 42. — • Cape Wankarema.
Sectio: Psetido-amphiprora.
X. arctica Cl. (K. Sv. Vet. Ak. Handl. XVIII, No 5, pag.
3) Finm., Kara (Matotschkin).
Sectio: Complexce.
X. (Schizonema) Grevillei Ag. (Grun. A. Diat. pag. 42. Nav.
Libellus Greg. N. rhombica Greg. Libellus Grevillei Cl. D. of
the A. S. pag. 18) Greenl. (Bessel\s Bay), Finm., Spitsb.
The largest specimen I have seen from Greenland measures
0,125 111111. in length and 0,024 111111. 111 breadth and has in
the middle 15 striae in 0,oi 111111.
X. (Schizonema) comoides Grev. (Van Heurck Syn. Pl. XVI,
fig. 3) Cape Deschnew (East Cape).
X. complanata Grun. (Amph. complanata Grun. A. Schm.
Atl. Pl. XXVI, fig. 45) Finm., Kara.
Sectio: Minutidce.
X. crassirostris Grun. (A. Diat. pag. 45, Pl. III, fig. 57)
Kara.
var. maasö ens is Grun. (1. c.) Fin 111.
V. kryokonites Cl. Elliptic, with obtuse ends. Striae
parallel, 22 in 0,oi 111m., absent or obsolete in the middle of the
valve. Length 0,os4 111111. Breadth 0,on 111111. — Pl. 37, fig. 44.
— Cape Wankarema.
var. suhprotracta Cl. Rhombic with produced, subcapitate
ends, striae 22 in 0,oi 111111. Length 0,033 111111. Breadth 0,007
111111. — Pl. 32, fig. 4G. — Cape Wankarema.
var. semiperfecta Cl. Striae 24 in 0,oi 111111., covering one
half of the valve, where they are of equal strength, and the
other half, except in the middle, where tliey are obsolete.
Pl. 37, fig. 45. — Cape Wankarema.
X. (kryokonites var.?) ivankaremce Cl. Elongate lanceolate.
Median line straight, central nodule small, terminal nodules
near the ends. Striae absent from the middle of the valve,
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