208 Ernst Østrup. 



Navicula superba Cl., var. subacuta Gran. A. S. Atl., Tab. CCLIX, 

 figs. 27—28. 



Lo с. Marg. of the Pack-ice. 

 Ar с t. Distr. East Arct. S. 



Navicula transitans Cl., Cl. Syn., II, 27; Cl. Vega Exp., Tab. 

 XXXVI, flg. 31. 



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

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



Navicula trigonocephala CI., CI. Syn., II, 27; Cl. Vega Exp., 

 Tab. XXXVI, flg. 29. 



Loc. Pack-ice, Marg. of the Pack-ice (4 sampl.). 

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



Navicula valida Cl. &Grun., Cl. Syn., II, 25; Cl. & Grün. A.D., 

 Tab. II, flg. 29. 



Loc. Marg. of the Pack-ice. 



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



Navicula valida Cl. & Grün., forma minor. Tab. nost XIII, fig. 8. 



Long. 4:0 fi. Lat. 16 u. Str. 8 in 10^, transverse lineatis. 



Valva elongate-elliptica. Raphe area distincta hyalina cincta. 

 Striis radiantibus, media in parte valvæ alternatim longis abbre- 

 viatisqve. 



L о с. Marg. of the Pack-ice. 



Undoubtedlj^ a narrower and smaller form, intermediate between \av. 

 valida and Nav. valida miiiula (Cl. 1. с). 



Navicula Zostereti Grun., CI. Syn., II, 31 ; A. S. Atl., Tab. XLVII, 

 figs. 42—44. 



Loc. Off Cape Amélie (Algæ), Koldewey Isl. (Algæ), Marg. of the Pack- 

 ice (3 sampl.). 



Arct. Distr. E. of Greenl. 



Navicula? gomphonemoides sp. nova. Tab. nost XIII, fig. 7. 



Long. 32^. Lat. b /u. Str. 10 in 10 /i, delicatissime punctatis. 



Valva anguste-lanceolata. Raphe leniter sinuosa. Striis radian- 

 tibus, Raplien attingentibus, media modo in parte valvæ paululum 

 abbreviatis. Nodulis terminalibus inconspicuis. 



Loc. Danmarks Havn (Algæ). 



This small form may perhaps be a Gomphonema. Onl}' a single specimen 

 found. 



Naviculæ pimctatæ CL, 1895. 



Navicula Baculus Cl., Cl. Vega Exp., 474, Tab. XXXVII, fig 51 

 (cf. Cl. Syn., I, 124: Stenoneis inconspicua (Greg) Cl. var. Baculus 

 Cl.). A. S. Atl., Tab. CCLXII, fig. 13. 



Loc. Marg. of the Pack-ice. 



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



