206 Ernst Østrup. 



Navicula distans W. Sm., Cl. Syn. II, 35; V. H. Trt., Tab. III, 

 fig. 133. 



Lo с. Koldewey Isl. (Algæ), Marg. of the Pack-ice. 

 Arct. Distr. W. Greenl., E. of Green., East Arct. S. 



Navicula inflexa Greg., Cl. Syn., II, 31; V. H. Trt., Tab. XXV, 

 fig. 713. 



Lo c. Off Cape Amélie (Algæ). 



Arct. Distr. East Arct. S. 



Navicula jamalinensis Cl., var. subcircularis var. nova. Tab. 

 nost XIII, fig. 2. 



Long. 35^. Lal. 24//. Str. 7—8 in 10 /z, sub apices 10 in 10 /7, 

 distincte transverse lineatis, 



Valva elliptica fere subcirculari. Raphe area hyalina, satis augusta, 

 cincta. Striis radiantibus. Nodulis terminalibus extremis in apicibus 

 situatis. 



Loc. Danmarks Havn (Algæ). 



This form may be a variety of Nav. Jamal, (cf. Cl. Syn., II, 38; Cl. Grim. 

 A. D., Tab. II, fig. 40). It differs from the main species by its almost circular 

 outline and by its apical area being much narrower and more linear than 

 in Nav. Jamal. 



Navicula jejuna A. Sch., var. arctica var. nova. Tab. nost XIII, 

 fig. 5. 



Long 68//. Lat. 8.5 1«. Str. 8 in 10//, obscure punctatis. 



Valva lineari, apices versus leniter attenuata. Striis radiantibus, 

 uno in latere valvæ raphen non attingentibus. Raphe sub apices 

 sinuosa. 



Loc. Marg. of the Pack-ice. 



This form has some resemblance to Nauiciila jejiinoides H. O. H. (Belgica 

 Exp., II, Tab. I, fig. 12) but its striæ are radiate throughout, and are equally 

 distant upon both sides of the raphe. 



The habitat of Nav. jejiinoides, according to H. Van Heurch (1. c), is 

 "Glace de banquise No. 141 ; assez frequent." 



Navicula kariana Grun., var. detersa Grun., CI. Syn. II, 28;^ 

 Grun. Fz.Js. L., Tab. 1, figs. 23-24. 



Loc. Marg. of the Pack-ice (3 sampl.). 



Arct. Distr. W. Greenl., E. of Greenl., East Arct. S. 



Navicula kariana Grun,, var. frigida Grun. Grun. 1. с fig. 25. 



Loc. Marg. of the Pack-ice (2 sampl.). 



Arct. Distr. W. Greenl., East Arct. S. 



Navicula (Schizonema) mollis W. Sm., CI. Syn., II, 26; V. H. 

 Syn., Tab. XV, figs. 22—23. 



Loc. Danmarks Havn (Algæ), Koldewey Isl. (Algæ). 



Arct. Distr. W. Greenl. 



Navicula obtusa Cl., Cl. Syn., II, 29; Cl. Vega Exp., Tab. XXXVI, 

 fig. 25. 



