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central is much 1 arger tlian the others. Stria) extremely fine,
about 36 in 0,oi mm. (sec Grunow) marginal. Length 0,oss
mm. Breadth 0,oo6 mm. Very rare in the Labuan material.
— Pl. 37, fig. 66.
N. Sigma var. intercedens Grun. (Casp. Sea. Alg. pag. 22).
Puncta 7, strice 30 in 0,oi mm.
N. obtusa W. Sm. Very long and slender form with 10
puncta and 27 strice in 0,oi mm.
N. (Homoeoclaäia) Vidovichi Grun. (Van Heurck Syn. Pl.
LXVII* fig. 7)
N. vitrea Norm. (Grun. Aret. Diat. pag. 93). Puncta
7, strice 24 in 0,oi mm. Length 0,i mm. Breadth 0,oos mm.
N. lanceolata W. Sm. var. with 10 puncta and 26 strice in
0,oi mm. Length 0,os mm. Breadth 0,oi mm.
N. longissima (Bréb.) Ralfs. (Van Heurck Syn. Pl. LXX,
fig. 1—2).
N. ventricosa Kitton (M. M. Jour. Nov. 1873, pag. 206, Pl.
XXXVIII. fig. 5).
Surirella fastuosa Ehb. (A. Sclnn. Atl. Pl. V, fig. 10—13).
S. cuneata O. Witt (A. Sclim. Atl. Pl. IV, fig. 1).
Campylodiscus ambiguus Grev. (A. Schm. Atl. Pl. XVIII, fig. 23).
C. undulatus Grev. (A. Schm. Atl. Pl. XVIII, fig. 11).
var. biangulatus Grev. (A. Schm. Atl. Pl. XIV, fig. 18).
C. Thuretii Bréb. a very small variety.
C. parvulus (AV. Sm.?) Aran Heurck (Syn. Pl. LXXVII, fig. 2).
C. Ralf sii Sm. (A. Schm. Atl. Pl. XI Ar, fig. 3).
Campylodiscus (?) cocconeiformis Grun (Cl. & Möll. Diat. No
178 and 214). Length 0,02—0,o36 mm. Breadth 0,oi8—0,o28 mm.
— Pl. 38, fig. 78.
Plagiodiscus nervatus Grun. (M. J. 1877, pag. 172, Pl. CXCIA".
fig. 9).
Baeteriastrum varians Laud. (Van Heurck Svn. Pl. LXXX,
fig. 3—5).
Chcetoceros diversus Cl. (\Tan Heurck Syn. Pl. LXXXI, fig. 5).
Ch. peruvianus Btw. (M. J. IAr, pag. 107, Pl. ATI, fig. 16
—18).
Podosira hormoides Mont. (A^an Heurck Syn. Pl. LXXXI A",
fig. 3).
Mel osira sulcata Ehb.
Melosira labuensis Cl. N. Sp. — ATalve as high as broad,
rounded at the end, covered by puncta arranged in straight
lines, radiating from the apex to the suture, 18 in 0,oi mm.
Ileight of valve 0,oos mm. Breadth 0,oi2 mm. — Pl. 38, fig. 84.
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