502 CLEVE, DIATOMS. 
central is much larger than the others. Strie extremely fine, 
about 36 in 0,01 mm. (sec Grunow) marginal. Length 0,os3 
mm. Breadth 0,006 mm. Very rare in the Labuan material. 
— PI. 37, fig. 66. 
N. Sigma var. intercedens Grun. (Casp. Sea. Alg. pag. 22). 
Puncta 7, strige 30 in 0,01 mm. 
N. obtusa W. Sm. Very long and slender form with 10 
puneta and 27 strige in 0,01 mm. 
N. (Homoeocladia) Vidovichi Grun. (Van Heurck Syn. PI. 
LX VII, fig. 7) 
N. vitrea: Norm. (Grun. Aret. Diat. pag: 93). Puncta 
, strie 24 in 0,01 mm. Length 0,1 mm. Breadth 0,008 mm. 
N. lanceolata W. Sm. var. with 10 punceta and 26 strize in 
0,01 mm. Length 0,08 mm. Breadth 0,01 mm. 
N. longissima (Bréb.) Ralfs. (Van Heurck Syn. Pl. LXX, 
fig. 1—2). 
N. ventricosa Kitton (M. M. Jour. Nov. 1873, pag. 206, Pl. 
KARSMIIL 95): 
Swrirella fastuosa Ehb. (A. Schm. Atl. Pl. V, fig. 10—13). 
S. cuneata O. Witt (A. Schm. Atl. Pl. IV, fig. 1). 
Campylodiscus ambiguus Grev. (A.Schm. Atl. P1. XVIII, fig. 23). 
C. undulatus Grev. (A. Schm. Atl. Pl. XVIII, fig. 11). 
var. biangulatus Grev. (A. Schm. Atl. Pl. XIV, fig. 18). 
C. Tlwuretii Bréb. a very small variety. 
C. parvulus (W. Sm. ?) Van Heurck (Syn. Pl. LXXVII, fig. 2). 
CC: Balfsi Sm. (A:Sebry Atl. Pl XIV jäs) 
Campylodiscus(?) cocconeiformis Grun (Cl. & Möll. Diat. Ne 
178 and 214). Length 0,02—0,036 mm. Breadth 0,018—0,028 mm. 
— PI. 38, fig. 78. 
Plagiodiscus nervatus Grun. (M. J. 1877, pag. 172, P1. CXCIV. 
fig. 9). 
Bacteriastrum varians Laud. (Van Heurck Syn. Pl. LXXX, 
fig. 3—5). j 
Chetoceros diversus Cl. (Van Heurck Syn. Pl. LXXXTI, fig. 5). 
Ch. peruvianus Btw. (M. J. IV, pag. 107, Pl. VII, fig. 16 
—18). 
Podosira hormoides Mont. (Van Heurck Syn. Pl. LXXXIV, 
fig. 3). 
Melosira sulcata Ehb. 
Melosira labuensis Cl. N. Sp. — Valve as high as broad, 
rounded at the end, covered by puncta arranged in straight 
lines, radiating from the apex to the suture, 18 in 0,01 mm. 
Height of valve 0,008 mm. Breadth 0,012 mm. — Pl. 38, fig. 84. 
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