VEGA-EXPEDITIONENS VETENSKAPLIGA ARBETEN. 497 
verse strie 16, slightly radiant, longitudinal 18 in 0,01 mm. 
— Port Jackson, rare. 
This species comes near to Navicula Veg Cl. (=Pleuro- 
sigma Kjellmanii Cl. Arct. Diat. Pl. IV, fig. 80). 
N. cancellata var. impressa Ldt. (Bih. t. K. Sv. Vet. Ak. 
Handl. 3 No 15, fig. 3). 
N. Zostereti Grun. (A. Schm. Atl. Pl. XLVII, fig. 44). 
The specimens from Labuan resemble exactly the figure 
quoted. The strie are very finely transversely lineate as in 
all species of the directa-group. 
N. Bruchii Grun. (K. Sv. Vet. Ak. Handl. 18, No 5, pag. 
13, Pl. III, fig. 35). This species, classed among the quadrin- 
seriat:e-group, is beyond doubt very nearly related to N. directa, 
and has transversely lineate strize. 
N. velata A. Schm. (Atl. Pl. XLVTIII, fig. 33—34). 
N. aspera Ehb. (A. Schm. Atl. P1. XLVIII, fig. 2—5). 
N. liber W. Sm. (A. Schm. Atl. Pl. L, fig. 16—18). 
NI mezenoes Ores, (CIMIS: IV, pag: 39, PI: VI fig:s2y In 
the Labuan material were found both the typical form (ÅA. S. 
Northsea Diat. Pl. II, fig. 44) and a variety with finer strige 25 
in 0,01 mm. Length 0,065. Breadth 0,015 mm. 
N. samoensis Grun. (A. Schm. Atl. Pl. L, fig. 43—44). 
Strie 10—13 in 0,01 mm. Length 0,054 mm. to 0,085 mm. Breadth 
0,015—0,)018 MM. 
N. blanda A. Schm. (N. Sea Diat. Pl. II, fig. 27). 
N. triundulata Grun. (T. M. S. 1877, pag. 178, Pl. CXCV, 
fig. 10). 
N. quadrisuleata Grun. (Novara Exp. Alg. pag. 101, Pl. I, 
fig. 14). 
Pleurosigma formosum W.Sm. (Van Heurck Syn. P1. XIX, fig. 4). 
P. decorum W. Sm. (Van Heurck Syn. Pl. XIX, fig. 1). 
Pl. angulatum W. Sm. — Oblique and transverse strize 20—21. 
Pl. strigosum W. Sm. (Van Heurck Syn. P1. XIX, fig. 2). 
P. rigidum W. Sm. (Van Heurck Syn. P1. XIX, fig. 3). 
P. australe Grun. (Novara pag. 21, Pl. I, fig. 18). 
P.: marinum Donk. (T. M. S.: VI, pag. 22, P1. III, fig. 3). 
'Transverse strie 20 oblique 19 in 0,01 mm. 
Donkinia carinata Donk. (Pleur. car. Donk. T. M. S. VI, 
pag. 23, Pl. III, fig. 5). Length of the valve 0,065 mm.; breadth 
0,014 mm. ”Transverse strixe 22, oblique 21—22 in 0,01 mm. 
D. recta Donk. (Pleur. r. D. 1. c. fig. 6). Length 0,093; 
breadth 0,012 mm. HLongitudinal strige 20, transverse strie 21 
in 0,01 mm. 
Bå III. 32 
