Diatoms from North-East Greenland. 219 



Loc. Koldewej' Isl. (Algæ). 



I think this large Nitzschia may be related to the group belonging to 

 Nitz. Sigma, perhaps it comes nearest to Nitz. Sigma valida. 



Nitzschia Sigma W. Sm. var. Sigmatelia Grün., V. H. Trt. 397, 

 Tab. XVI, fig. 535. 



Loc. Ort' 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. & Grün, forma longis- 

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

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

 Arc t. Di Str. W. Greenl. 



Lineares Grün., 1880. 

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

 Loc. Off Germ. 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. Ort" Cape Amélie (Algæ, 2 sampl.), Koldewey Isl. (Algæ). 

 Arct. Distr. E. of Greenl. 



Arraphideæ. 



Synedra Ehr., 1831. 



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



Loc. Olf Cape Amélie (Algæ, 3 sampl.), Danmarks Havn (Algæ). 



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

 fig. 14. 



Loc. Koldewey Isl. (Algæ). 



Synedra affinis Kütz., fasciciilata Kütz., V. H. Trt., Tab. X, fig. 433. 



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

 (Algæ). 



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

 Tab. XLI, fig. 9 В. 



Loc. Koldewey Isl. (Algæ). 



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

 fig. 28. 



Loc. Ort" Cape Amélie (Algæ). 



Synedra affinis Kütz., parva Kütz., V. H. Trt., Tab. X, fig. 432. 



Loc. Koldewey Isl. (Algæ). 



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

 fig. 27. 



Loc. Koldewey Isl. (Algæ, 2 sampl.). 



