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convex valve 9 in the middle, 10 in 0,oi mm. toward the ends,
reaching almost to the median line; on the concave valve 8—
10, on one side of the valve not reaching the median line,
on the other reaching the median line, but interrupted by a
linear area.
Length 0,06 mm. Breadth 0,02 mm. — Pl. 36, fig. 23.
Cape Wankarema.
var. elliptica Cl. Valve elliptic. Striae parallel, 10 in 0,oi
mm. Length 0,065 mm. Breadth 0,02 mm. — Pl. 36, fig. 24.
Cape Wankarema.
The concave valve of this variety is scarcely different
from N. incudiformis Grun.
N. (Rhoikoneis) obtusa Cl. N. Sp. (Rlioic. obtusa Cl. in Cl.
& Möll. Diat. 315—318) Elongated, linear, with rounded obtuse
ends. Strice curved, not parallel, very faintly lineate, on one
half of the valve reaching the median line, on the other
end-ing at some distance, irregularly interrupted, 11 in 0,oi mm.
Length 0,075 mm. Breadth 0,oi4 111111. — Pl. 36. fig. 25. — Cape
Wankarema.
N. (Rhoikoneis) Solleana Grun. (Verli. 1863, pag. 147, Pl.
XIII, fig. 11) Greenl., Spitsb., Finm., Kara (Matotschkin), Cape
Wankarema.
Specimens from Greenland have 8 radiant striae in 0,oi
111111. in tlie middle, 12 near the ends. Specimens from
Wankarema are less arcuate, have in 0,oi 111111. 10 striae, which are
almost parallel. The strire are transversely finely lineate as in all
species of the directa-group. Mr. Grunow has named this variety
from Wankarema Rh. BoUeana var.? Siberica (Cl. & Möll. Diat.
No 302.) — Pl. 37, fig. 38. — Another variety from Cape
Wankarema has asymmetric striation and 11 striae in 0,oi 111111. var.
asymmetrica Cl. length 0,045 111111. breadth O.01 111111. Pl. 37, fig. 39.
N. kar iana Grun. (A. Diat. pag. 39, Pl. II, fig. 44) Kara,
F. J. L., Cape Wankarema.
a. genuina Striae 12—14 in 0,oi 111111. Length 0,o85 111111.
Breadth 0,o26 111111. — Kara, F. J. L., Cape Wankarema.
ft. detersa Grun. Mpt, Striae interrupted 011 botli sides of
the median line by more 01* less broad areas. Length 0,oo
111111. Breadth 0,024 mm. — Kara, F. J. L., Cape Wankarema.
— Pl. 36, fig. 36.
T. minor Grun. (A. D. pag. 5. N. frigida Grun. A. D. pag.
39) Striae 16—18 in 0,oi 111111. Length 0,044—0,07 111111. Breadth
— ____ %
0,012—0,oi3 mm. — Kara. F. J. L.
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