Diatoms from Xorth-East Greenland. 219 



Loc. Koldewey Isl. (Algæ). 



I think this large Nitzschia ma\' be related to the group belonging to 

 i\7/r. Sigma, perhajis it comes nearest to A7/r. Siqma valida. 



Nitzschia Sigma W. Sm. var. Sigmatella Grun., V. H. Trt. 397, 

 Tab. XVI, fig. 535. 



Loc. Oir Cape Amélie (Algæ). 



Not before recorded from Arctic Seas. According to Perag. (Diat. mar. 

 d. Fr. 290) "Répandu." 



Nitzschia Sigma W. Sm., var. valida Cl. & Grun. forma longis- 



sima. V. H. Syn., Tab. LXV, fig. 4. 



Loc. Koldewe}' Isl. (Algæ, 3 sampl.). 

 Arc t. Distr. W. Greenl. 



Lineares Grun., 1880. 



Nitzschia polaris Grun. Grun. Fz. Js. Ld., 54, Tab. I, figs. 62—63. 



Loc. Olf Gcrm. L. (Land-Ice), Marg. of the Pack-ice (4 sampl.). 

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



Lanceolatæ Grun., 1880. 



Nitzschia lanceolata W. Sm., V. H. Trt. 400, Tab. XVII, fig. 548. 



Loc. Oir Cape Amélie (Algæ, 2 sampl.), Koldewey Isl. (Algæ). 

 Arct. Distr. E. of Greenl. 



Arraphideæ. 



Syiiedra Ehr., 1831. 



Synedra affinis Kiitz., genuina. V. H. Trt. 314, Tab. X, fig. 430. 



Loc. OÏÏ Cape .Vmélie (Algæ, 3 sampl.), Danmarks Havn (Algæ). 



Synedra affinis Kiitz., acuminata Grun., V. H. Syn., Tab. XLI, 

 fig. 14. 



Loc. Koldewey Isl. (Algæ). 



Synedra affinis Kùiz.,fasciculata Kùtz., V. H. Trt., Tab. X, fig. 433. 



Loc. Olf Cape Amélie (Algæ), Danmarks Havn (Algæ), Koldewey Isl. 

 (Algæ). 



Synedra affinis Kiitz,, hybrida Grun. forma elongata, V. H. Syn., 

 Tab. XLI, fig. 9 B. 



Loc. Koldewey Isl. (.\lgæ). 



Synedra affinis Kiitz., lancettula Grun., V. H. Syn., Tab. XLI, 

 fig. 28. 



Loc. Oir Cape Amélie (Algæ). 



Synedra affinis Kûtz., parua Kiitz., V. H. Trt., Tab. X, fig. 432. 



Loc. Koldewe\- Isl. (.\lgæ). 



Synedra affinis Kiitz.? rupicola Grun., V. H. Syn., Tab. XLI, 

 fig. 27. 



Loc. Koldewey Isl. I Algæ, 2 sampl.). 



