ill!Ill

STENONEIS.
GENUS 12. STENONEIS CLEVE, 1894.
Fig. 40.
Stenoneis plate 28, fig. 789.
inconspicua.
241
Valve narrow, with rounded apices. Central
and terminal nodules very small, rounded. Raphe
indistinct, bordered by two strong ribs or silicious
costae. Transverse striae fine. Axial area indistinct.
Only one species known,
S. inconspicua Greg, (sub Navicula (?) Diat.
of Clyde, p. 6, pi. 1, f. 3 ; Cleve Synop., pi. 5,
f. 28*),
Valve linear, frequently gibbous in the median portion, with apices
rounded, obtuse ;
nodules small, the terminal ones somewhat distant from the
apices. Raphe bordered by two strong silicious costae. Striae 26 to 1 c.d.m.,
perpendicular to the raphe throughout, absent at the median portion where
there is a broad hyaline transverse band. Length. 5 c.d.m. Breadth, 75
c.d.m.
Marine. North Sea (Scotland, Greg., Bahusie, Cleve.).
Fig. 41.
GENUS 13. CISTULA CLEVE, 1894.
Cistula Lorenziana,
Valve rectangular, broad. Central nodule
very small. Raphe between two strong
silicious costae. Striae radiant, slightly inter-
rupted by several hyaline
bands.
Only one species known.
longitudinal
C. Lorenziana Grun. (sub Navicula in Verh., i860, p. 547, pi. 3,
f. 3* ; Cleve Syn., pi. 1, f. 31), plate 28, fig. 790.
Valve rectangular, sometimes somewhat gibbous
in the middle and at the
apices. Striae gently radiant, about 17 in 1 c.d.m., composed of elongated
R
y