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forma eiirta Cl. Length 0,03—0,o4 mm. Breadth 0,009—
0,oi mm. Striae 12 in 0,oi mm. — Davis strait, Cape Wankarema.
Cape Deschnew (East Cape). — Pl. 37, fig. 40.
N. kariana Grun. passes over to N. transitans, which
scarcely differs in anything but coarser striae and is by the
latter connected with N. Zostereti and N. directa. According to
Grunow the lineation of the striae of N. Kariana forms lonoi-
o
tudinal line lines, which may be explained bv the
approximation of the striae. Nearly allied to N. Kariana seems to me
to be the following species.
X. subimpressa Grun. (A. Diat. pag. 39, Pl. II, fig. 45) Kara.
var.? tenuior Cl. Length 0,o38 mm. Breadth 0,oi5 111111.
Striae 18 in 0,oi 111111. — Pl. 37, fig. 49. — Cape Deschnew (East Cape).
X. distans S111. (Syn. I, pag. 56, Pl. XVIII, fig. 169) Greenl.,
(Davis strait) Spitsb., Finm.
var. borealis Grun. (A. Diat, pag. 38, Pl. II, fig. 42) Spitsb.,
Finm.
Sectio: Iletusce.
X. fortis Greg. (A. Sclim. Atl. Pl. XLVI, fig. 37—39) Greenl.,
Spitsb.
X. opima Grun. (A. Schm. Atl. Pl. XLVI, fig. 25—26) Greenl.,
(Davis strait).
X. jamalinensis Cl. (A. Diat. pag. 13, Pl. II, fig. 40) Jalmal,
Cape Deschnew (East Cape).
X. cancellata Donk. var. impressa Ldt, (N. impressa Ldt.
Bili. t. K. Sv. Vet. Ak. Handl. B. III, No 15, pag. 33, fig. 3)
Greenl. (Davis strait), Finm., Kara.
var. Gregorii Grun. (A. Diat, pag. 37) Finm., Kara.
var. subapicidata Grun. (1. c.) Kara.
var. Sclimidtii Grun. (1. c.) Spitsb., Cape Deschnew (East Cape).
var. minuta Grun. (1. c.) Finm., Cape Deschnew (East Cape).
X. inflexa Greg. (A. Schm. Atl. Pl. XLVI, fig. 69—70) Kara.
X. retusa Bréb. Cape Wankarema.
I give a delineation of a specimen from Cape
Wankarema, according to Grunow the typic N. retusa. It has
been drawn Pl. 36, fig. 35 a, b, from a dry specimen in two
different foci.
Sectio: Decipi entes.
X. Lundströmii Cl. (A. D. pag. 13, Pl. II, fig. 29) Kara.
X. plicata Donk. (B. D. Pl. IX, fig. 21) Kara.
X. subinflata Grun. Mpt. —Linear oblong, more or less gil
>-bous in the middle, with rounded obtuse ends, very convex.
Central striae stronger and more distant, the others ratlier pa-
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