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pag. 39, Pl. II, fig. 43) Striae 8 in 0,oi mm. on one lialf of tbe
valve more approximate to the median line than on the other,
and on this half interrupted. Length 0,095—0,os mm. Valves
sometimes arcuate.
Cape Wankarema. Pl. 36, fig. 26, 30.
This variety seems to connect Nav. (Rhoikoneis) superba
Cl. with N. transitans.
N. Zostereti Grun. — More or less lanceolate. Striae slightly
radiant, distinctly tranversely lineate; striae 5 to 12 in 0,oi
mm., more approximate at the ends.
forma genuina (A. Schm. Atl. PL XLVII, fig. 42—44 with
about 7 striae in 0,oi mm.). Specimens from Kara have 9 strire
in 0,oi mm. Length 0,i mm. Breadth 0,02 mm.
var. acutiuscnla Greg. (Pinn. acutiuscula Greg. T. M. Soc.
IV, pag. 48, Pl. V, fig. 21) Striae about 11 in 0,oi mm. — Kara.
(Length O,06 mm. Br. 0,oi mm.)
Nav. longa Greg. (1. c. fig. 18) with 5 str. in 0,oi, may
per-liaps be regarded as a form of N. Zostereti, were ncft the median
line described as generally twisted, which character seems to
indicate that N. longa is a Scoliopleura.
N. erosa Cl. — More or less elliptic, about 5 times longer
than broad, tapering regularly from the middle to the ends.
Striae coarse, 7 1 /2—10 in 0,oi mm., transversely finely lineate,
a little radiant, interrupted, so that tliey have the appearance
of being composed of fragments. Central nodule surrounded
by a small area. Length 0,i mm. Breadth 0,02 mm. — Pl. 36,
fig- 28. — Cape Wankarema.
N. (Rhoikoneis) trigonocephala Cl. N. Sp. — Linear with
pa-rallel sides and cuneate, sometimes protracted ends. Valves
often arcuate. Striae coarse 10—12 in 0,oi mm., almost
paral-lel, interrupted as in N. erosa, transversely lineate. Length
0,05—0,065 mm. Breadth 0,oi—0,oi2 mm. — Pl. 36, fig. 29. — Cape
Wankarema.
N. asymmetrica Cl. N. Sp. — Elongated elliptic, 4—5 times
longer than broad. Striae almost parallel, interrupted, 9 \/2 in
0,oi mm., transversely lineate, on one half of the valve reaching
the median line, on the other ending at some distance from
it. Length 0,i mm. Breadth 0,023 mm. — Pl. 36, fig. 27. — Cape
Wankarema.
Perhaps an asymmetric variety af N. erosa.
N. (Rhoikoneis) superba Cl. Valves rhombic, arcuate (or
sometimes straight), convex and concave valves being more or
less different. Striae almost parallel, transversely lineate, on the
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