Diatoms from North-East Greenland. 241 



Striis radianlibus, sub apices leniter convergentibus, media in valva 

 spatiatis. 



Loc. Dove Bui»t. 



I think this form may he a variety of Xao. gracilis, perhaps most nearly 

 allied to Nav. grac. var. schizonemoides figured in V. H. Syn., Tab. XV, fig. 37 

 (the second figure). 



Navicula lanceolata (Ag.?) Kûtz, Cl. Syn., II, 21; V. H. Tit., 

 Tab. III, fig. 139. 



Loc. Off Cape Amelie (Algæ), Hvalrosodde, Vester Elv. 



Not before recorded from Arctic regions. Several other records. 



Navicula lanceolata var. tenella A. S., A. S. Atl., Tab. XLVII, 

 figs. 45—46. 



Loc. Off Cape Amélie (Algæ), Danmarks Havn (Algæ). 



Not before recorded from Arctic regions. Other records, Sweden, Loka 

 (Cl. 1. c). 



Navicula Placentula Ebr., Cl. Syn., II, 23; V. H. Trt., Tab. III, 

 fig. 135 (Nav. Gastrum Placentul.). 



Loc. Otr Cape Amélie (Algæj, Marg. of the Pack-ice (2 sampl.). 

 A ret. I) i sir. Yenissey. 



Navicula radiosa Kùtz., Cl. Syn., II, 17: V. H. Trt., Tab. III, 



fig. 112. 



Loc. Hvalrosodde. 



A ret. Distr. \V. Greenl., E. Greenl., Spb., B. El. 



Navicula rhyncocephala Kûtz., Cl. Syn., II, 15; V. H. Trt., 

 Tab. III, fig. 119. 



Loc. Ort" Caj)e Amélie (Algæ, 2 sampl.). 

 Arct. Distr. B. El. 



Navicula viridula Kütz. var, slesuicensis Grun., Cl. Syn., II, 15; 

 V. H. Trt., Tab. III, fig. 118. 

 Loc. Dove Bugt. 

 Arct. Distr. W. Greenl., E. Greenl. 



Navicula sp. Tab. nost XIV, fig. 9. 



Long. 21«. Lat. 5,4 /i. Striis inconspicuis. 



Valva lanceolata apicibus capitatis. Raphe distincta. 



Loc. Dove Bugt. 



This small form shows only very few, if any, distinct characters. I 

 think I have seen indications of a striation which, at least in the middle of 

 the valve, seemed to me to be radiate, but I am not quite certain; therefore I 

 do not feel justified in recording it as a new species. 



Naviciilæ punctatæ Cl., 1895. 



Navicula pusilla W. Sm. var. capitata var. nova. Tab. nost. XIV, 

 fig. 10. 



XLUI. 19 



