250 Ernst Østrup. 



Lanceolatœ Gru п. 

 Nitzschia fonticola Grün, var.? Tab. nost. XIV, fig. 16. 

 Long. 13 и. Lat. 4/^. Punclis carinalibns 11 — 12 in 10//. Striis 

 inconspicuis. Valva lanceolata, carena valde excentrica. 



Loc. Hvalrosodde. 



This small form mav be allied to Nit:, fontic, V. H. Syn., Tab. LXIX, 

 figs. 16—17. 



Nitzschia Hantzschiana Rabh. CI. & Grun. A. D., 99; V. H. Syn., 

 Tab. LXIX, figs. 1—2. 

 Loc. Vester Elv. 

 A г ct. Distr. Fz. Js. Ld., Spb. 



Nitzschia Palea (Kiitz) W. Sm. var. minuta Bleisch., Cl. & Grun. 

 A. D., 96; V. H. Syn., Tab. LXIX, fig. 23. 



Loc. Danmarks Havn (Algæ). 



A ret. Distr. E. Greenl., Fz. Js. Ld., J. M. 



Nitzschia Palea var. teimirostris Grun.; V. H. Trt., 402, Tab. XVII, 

 fig. 556 (the second figure). 

 Loc. Hvalrosodde. 

 Arct. Distr. И. El., J. M. 



Arraphideæ. 



Ceratoueis Ehr., 1840. 



Ceratoneis Arcus Kütz.; V. H. Tri., 306, Tab. X, fig. 401. 



Loc. Lille Snenæs. 



Arct. Distr. W. Greenl., E. Greenl., Fz. Js. Ld., Spb., B. El. 



Syuedra Ebr, 1831. 



Synedra radians (Kütz.) Grun.; V. H. Trt., 312, Tab. X, fig. 423. 



Loc. Hvalrosodde. 



Not before recorded from Arctic regions. Several other records. 



Synedra Ulna (Nitsch.) Ebr.? 



Loc. Hvalrosodde, Koldewey Isl. (Algæ). 



I have only seen a few fragments, so that an exact determination is 

 impossible. 



Synedra Vaucheriae Kiitz. var. sept entr ionalis var. nova. Tab. 

 nost. XIV, fig. 19. 



Long. 23 — 30/^. Lat. 3,6 /^. Sir. 16 in 10 /^, an punctatis? 



Valva lineari apicibus capitatis subcapitatisve. Striis parallelis, 

 altera in parte media valva deficientibus ibiqve areolam unilateralem 

 relinqventibus. 



Loc. Vester Elv (4 sampl.), Lille Snenæs. 



As this small species occurs in the samples both free and also attached 

 to the narrow branches of algæ, but never in the form of long bands, I 



