BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 24. AFD. III. N:0 2. 5 



N. contenta rar. hiceps xA.rn. — Not rare in several 

 samples. 



N. semen Ehb. — Cape Flora, verv rare. 



N. gihhula Cl. — Not rare in several samples. 



Stauroneis anceps Ehb. — Common in niost samples. The 

 most freqnent form is var. aniphicephala KtJTZ. (L. 0,04.'i; 

 B. 0,0 11 mm. §tr. 21 in 0,oi mm.). — Also v. linearis is 

 not rare. 



S. phoenkenteron v. amphilepta Ehb. — Cape Flora, rather 

 rare. (L. 0,07.5; B. O,oi-t mm. Str. 21 in O.oi mm.). 



S. ohtusa Lägst. — E-are at Cap Neale 011 roots of Luzula 

 hyperhorea. 



S. javanica Grun. -— Very rare, Cape Flora. 



Navicula capitata Cl. N. sp. — Valve elongated, 

 linear, with capitate ends. L. 0,03.5; B. 0,oo8 mm. 

 Axial area very narrow. Central area small. StricU 

 17, not niore crowded at the ends, sliglitly radiate 

 througliout, not distinctly punctate. 



Occnrs sparingly in some samples from Cape Flora. 



This form is a trne Navicula, having no locnli- 

 feroiis ring as Mastogloia, to which it bears some re- 

 semblance. It has the ontline of N. snbtilissima Cl., 

 but the strite are very distinct. It might perhaps be yw 

 the form figured by Lagerstedt as Stauroneis linearis. 



Cymhella amphicephala N.egeli. — Not rare, but never 

 abundant. L. 0,025; B. 0, 007 5 mm. Str. 12 in 0, 01 mm. 



C. lata Grun. — L. 0,045; B. 0,oi5 mm. Str. 12 — 13 in 

 0,01 mm. — Cape Flora, sparingly in some samples. — Scarcely 

 distinguishable from C. Ehrenher(/ii v. delecta. 



C. stauroneiformis Ldt. — Occnrs in many samples. 



C. naviciiliformis Auersw. — Not rare in many samples. 



C. heteropleura v. minor Cl. — Found sparingly in some 

 samples. 



C. ventricosa Kutz. — Cape Flora, rare. • 



C. cistulq Hempr. — Rare at the eastern glacier, Cape 

 Flora. 



r. arctica Ldt. — Not rare in several samples. — Cape 

 Flora, Bell Isle. 



Goynplionema angustatum Kutz. — A variety with slightly 

 rostrate ends. — L. 0,03; B. 0,oo7 mm. Str. 17 in 0,oi mm. 

 — Not rare in most samples. 



