VEGA-EXPEDITIONENS V ET EN S K A P L IG A AltBKTKK. 497 



verse strite 16, slightly radiant, longitudinal 18 in 0,oi mm. 

 — Port Jackson, rare. 



This species comes near to Navicula Vegfc CI. (=Pleiiro- 

 sigma Kjellmanii CI. Arct. Diat. PI. 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. PI. XLVIT, fig. 44). 



The specimens from Labuan resemble exactly the figure 

 quoted. The striae are very finely transversely lineate as in 

 all species of the directa-group. 



N. Bnichii Grun. (K. Sv. Vet. Ak. Handl. 18, No 5, pag. 

 13, PI. Ill, fig. 35). This species, classed among the quadrin- 

 seriatae-group, is beyond doubt very nearly related to N. directa, 

 ^nd has transversely lineate striae. 



N. velata A. Schm. (Atl. PI. XLVIII, fig. 33—34). 



N. aspera Ehb. (A. Schm. Atl. PL XLVIII, fig. 2—5). 



N. liber W. Sm. (A. Schm. Atl. PI. L, fig. 16—18). 



N. maxima Greg. (T. M. S. IV, pag. 39, PI. V, fig. 2). In 

 the Labuan material were found both the typical form (A. S. 

 North sea Diat. PI. II, fig. 44) and a variety with finer striae 25 

 in 0,01 mm. Length 0,065. Breadth 0,oi5 mm. 



N. samoensis Grun. (A. Schm. Atl. PL L, fig. 43 — 44). 

 Striae 10 — 13 in 0,oi mm. Length 0,054 mm. to 0,085 mm. Breadth 

 0,015 — 0,018 mm. 



N. hlanda A. Schm. (N. Sea Diat. PL II, fig. 27). 



N. triundidata Grun. (T. M. S. 1877, pacr. 178, PL CXCV, 

 fig. 10). 



N. rpiadrisidcafa Grun. (No vara Exp. Alg. pag. 101, PL I, 

 fig. 14). 



PleiirosigmaformosmnW. Sm. (Van Heurck Syn. PL XIX, fig. 4). 



P. decorum W. Sm. (Van Heurck Syn. PL XIX, fig. 1). 



P/. angnlatnm W. Sm. — Oblique and transverse striae 20 — 21. 



P/. strigosiim W. Sm. (Van Heurck Syn. PL XIX, fig. 2). 



P. rigidum W. Sm. (Van Heurck Syn. PL XIX, fig. 3). 



P. anstraJe Grun. (Novara pag. 21, PL I, fig. 18). 



P marhmm Donk. (T. M.S. VI, pag. 22, PL III, fig. 3). 

 Transverse striae 20 oblique 19 in 0,oi mm. 



Bonhinia carinata Donk. (Pleur. car. Donk. T. M. S. VI, 

 pag. 23, PL III, fig. 5). Length of the valve 0,o65 mm.; breadth 

 0,014 mm. Transverse striae 22, oblique 21 — 22 in 0,oi mm. 



D. recta Donk. (Pleur. r. D. 1. c. fig. 6). Length 0,093; 

 breadth 0,012 mm. Longitudinal strias 20, transverse striae 21 

 in 0,01 mm. 



Bd III. - 32 



