236 Ernst Østrup. 



Lo с. Hvalrosodde, Lille Snenæs (2 sampl.), Vester Elv (2 sampl,), Thermo- 

 meter fjeld. 



Arct. Distr. E. Greenl.. Fz. Js. Ld., Spb., J. M. 



Navicula gibbula var. capitata Lgst., Lgst. 1. c, fig. 7 a^, Tab. 

 nost. XIV, fig. 2. 



Lo c. Hvalrosodde, Nostoc. 



Arct. Distr. E. Greenl., Spb. 



This form, of which I have given a figure, difTers in the striation, which 

 in the main species is radiate, but here is radiate only in the middle and 

 parallel towards the apices. Lagerstedt has not shown the striation in his 

 fig. 7 a\ but with regard to the outline and general appearance his figure 

 agrees very well with the present form. Therefore I have no doubt that the 

 present form is identical with Nav. gibb. capitata Lgst. 



Navicula Lagerstedtii CI., CI. Syn., I, 141 ; Lgst., Spb., Tab. 11^ 

 fig. 12 (Navicula sp.). 

 Loc. Hvalrosodde. 

 Arct. Distr. E. Greenl., Spb. 



Naviculæ microstigmaticæ Cl., 1894. 

 Stauroneis anceps Ehr., Cl. Syn., I, 147; V. H. Tri., Tab. I, 

 figs. 55—57 (including also St. anc. linearis and St. anc. amphicephala). 

 Loc. Hvalrosodde, Dove Bugt, Lille Snenæs, Vester Elv (3 samples). 

 Arct. Distr. W. Greenl., E. Greenl., Spb., J. M. 



Stauroneis dilatata Ehr. forma minor Tab. nost XIV, fig. 3. 



Long. 31/1. Lat. 8 ft. Striis subtilissimis. 



Valva elliptice-lanceolata, apicibus capitatis. Raphe area hyalina,. 

 mediam valvam versus patescente, cincta. Stauro lato margines non 

 attingente. Striis radiantibus. Nodulis terminalibus inconspicuis. 



Loc. OÏÏ Cape Amélie (Algæ). 



Arct. Distr. The main species: Europe, Siberia. 



Stauroneis javanica Grun., var, oblonga Øst., Øst., Ferskv. 

 D. f. Østgr., 260, Tab. I, fig. 4. 



Loc. Hvalrosodde (2 sampl.), Lille Snenæs. 

 Arct. Distr. E. Greenl. 



Stauroneis javanica Grun., var. truncata Øst., Øst, 1. с. fig. 5. 



Loc. Stormkap, Vester Elv. 

 Arct. Distr. E. Greenl. 



Stauroneis obtusa Lgst., Cl. Syn., I, 149; Lgst., Spb., Tab. I, 

 fig. 11. 



Loc. Hvalrosodde. 



Arct. Distr. Fz. Js. Ld., Spb. 



Stauroneis parvula Grun., Cl. Syn., I, 149; O. Müll,, Riesengeb,, 

 Tab, III, fig, 33, 



Loc. Hvalrosodde, Lille Snenæs. 



Not before recorded from Arctic regions. Other record, Europe. 



