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A. turgida Greg. (Diat. of Clyde. pag. 510, Pl. XII, tig. 63.
A recta Leud. Fortm. Ceyl. pag. 21, Pl. I, tig. 14). Length of
the frustle 0,024 mm. Br. 0,oi5 mm. Striae 12 in 0,oi mm.
A. cymbifera Greg. — Length 0,09 mm. Striae 9 in 0,oi mm.
A. cymbelloides Grun. (Hedwigia 1867, VI, pa^. 24, Cl. &
Möll. Diat. No 147).
A. Javanica A. Schm. (Atl. XXVII, fig 27).
A. Proteus Greg. (Diat. of Clyde pag. 518, Pl. XIII, tig. 81).
var. robusta Greg. (A. robusta A. Schm. Atl. Pl. XXVII,
fig. 39—41).
var. mexicana A. Schm. (A. mexicana A. Schm. Atl. Pl.
XXVII, tig. 47—48).
A. obtusa Greg. (A. Schm. Atl. PL XL, fig. 16—17).
A. furcata Leuduger Fortm. (Diat. de Ceylon pag. 20, PL
I, fig. 11. A. spectabilis A. Schm. Atl. PL XL, fig. 20—23).
A. tabuensis Cl. N. Sp. — Frustle rectangular, with straight
margins. Median lines straight. Central nodule small, not
transversely dilated. Connecting membrane without
longitu-dinal lines. Striae very coarse and distant, 6 in 0,oi mm.,
parallel, with very tine transverse striation. Length 0,o6 mm.
Breadth 0,o2 mm. — PL 35, fig. 1 a Fr. V. fig. b. S. V.
This species, which has the outline of A. Donkinii Rab =
A. lineata Donk. is remarkable for its verv coarse striae. Mr.
v
Grunow informs me that he has seen the same species in a
gathering from the Adriatic Sea.
Stauroneis australis Grev. (Ed. N. Phil. J. Vol. XVIII, pag.
187, fig. 13, 1863 H. Stauroneis biformis Grun. Verh. 1863, pag.
154, PL XIII, tig. 7). This most interesting form, described the
same year by Grunow and Greville, does not seem to belong
to the genus Stauroneis, but to a new genus, nearly related
to Mastogloia and distinet from the latter genus by having
short marginal costre instead of the loculi. This form occurs
sparselv in the Labuan material. I have also seen it in a
gathering from Port Jackson. Mr. Grunow mentions it as an
inhabitant of the Red Sea. The Labuan specimens have 14—
15 finely punctate striae in 0,oi mm. Length 0,osg mm. Breadth
0,035 mm.
St. bistriata Leuduger Fortm. (Diat. de Ceylon pag. 37,
Pl. IX, fig. 89). I have seen only a single valve of this spe-
cies, which seems to belong to the genus Achnanthes. The
striae, 10 in 0,oi mm., are costate and less divergent than in
the figure of Mr. Leuduger. Length 0,ost mm. Breadth 0,ooo mm.
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