'2'AH Ehnst Os IUI' I'. 



Lo c. Hvalrosodde. Vester K\v. 



Not before recorded Ironi Arctic regions. Several other records. 



Cymbella naviculiformis Auersw., CI. Syn., 1, 1(30; Lgsl., S])b., 



Tab. II, fig. 18 (Cymb. anglica). 



Loc. Mvalrosodde. 



A ret. Distr. W. C.reenl., I-:. Creenl., Spb., H. El. 



Cymbella septentrionalis sp. nova. Tab. nost. XIV, fig. 4. 



Long. 32 — 56 /i. Lat. 7 — 8/^. Sir. 14 in 10 /i, delicalissime trans- 

 verse lineatis. 



Valva fere cymbiformi, apicibus margineni dorsalem versus 

 paululum recurvatis. Margine venlrali subundulata. Raphe leniter 

 arcuata, area hyalina distincta, media in valva in aream centralem 

 longinam dilatata, cincta. Nodulis terminalibus marginem dorsalem 

 versus recurvatis. 



Loc. Hvalrosodde (2 sampl.). 



Very nearly linear specimens of this species sometimes occur. 



Cymbella sinuata Greg., CI. Syn., I, 170; V. H. Trt., Tab. XXV, 



fig. 699 (Cymb. abnormis). 



Loc. Hvalrosodde. 



Not before recorded from Arctic re{*ions. Several other records. 



Cymbella stauroneiformis Lgst., CI. Syn., I, 165; Lgst., Spb., 



Tab. 1, fig. 15. 



Loc. Hvalrosodde (2 sampl.), Vester Elv. 

 Arct. Distr. E. Greenl., Fz. .Is. Ld., Spb. 



Cymbella ventricosa Kütz., Cl. Syn., I, 168; V. H. Syn., Tab. III, 

 fig. 15 (second fig. Encyon. ventr.). 



Loc. Vester Elv. 



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



Cymbella ventricosa var. ovata Grun., V. H. Trt., Tab. I, fig. 48 



(Encyon. cæspit. lata). 



Loc. Vester Elv. 



Not before recorded from Arctic regions. Several other records. 



Cymbella ventricosa var. semicircularis Lgst., Lgst., Spb., 

 Tab. II, fig. 20 (Cymb. affinis semicirc). 



Loc. Dove Bugt. 



Arct. Distr. E. Greenl., Spb. 



This variety, which Cleve (Syn. I, 168) piaces under Cymb. ventricosa 

 seems to be so peculiar in appearance that it certainly may be considered 

 a distinct variety. 



In a sample labelled "Nostoc" I found a Cymbella, which is figured in 

 V. H., Syn., Tab. Ill, fig. 18 as a "Forme moyenne entre r Encyonema cœspito- 

 snm et I'Encyonema Lunula." 



