Diatoms from North-East Greenland. 229 



The above table shows that the following is the distribution 

 in the samples of the 37 genera which occur — 19 (51.4 ^'/o) in Alga- 

 and ice-samples, 12 (32.4 ^'/o) both in Alga- and ice-samples, and 6 

 (16.2 ^/o) in ice-samples. 



With regard to the species and varieties we find the proportions 

 to be as follows: — 



In the Alga-samples are found 129 (70.9 "/o) 



In the ice-samples are found 45 (24.7 *^/o) 



Both in the Alga- and ice-samples are found 8 (4.4 ^/o) 



All the figures were drawn magnified 1000 times by the author, 

 and then photographically reduced to a magnification of 660. 



Fig. 1. Navicula rostelloides sp. nova Page 201 



— 2. — jamalinensis CI., var. siibcircularis var. nova — 206 



— 3. Trachyneis aspera (Ehr.), Cl., var. intermedia Grün, forma robiista. . — 204 



— 4. Navicula peregrina Ehr., var.? oblonga var. nova — 207 



— 5. — jejuna A. Seh., var. arctica var nova — 206 



— 6. — subcuneata, sp. nova — 207 



— 7. — ? gomphonemoides, sp. nova — 208 



— 8. — valida. Cl. & Grun. forma minor — 208 



— 9. — Ljra Ehr., var. arctica var. nova — 209 



— 10. — scopulorum Bréb., var. arctica var. nova — 203 



— 11. Amphora gigantea Grun — 210 



— 12. — virgata, sp. nova — 210 



— 13. Cocconeis pinnata, Greg., var. arctica var. nova — 213 



— 14. — ornata, Greg.? — 214 



— 15. Achnanthes hjberborea, Grun — 214 



— 16. Amphora venusta, sp. nova — 212 



— 17. Cocconeis sp — 214 



— 18. Achnanthes rhombica, sp. nova. — 215 



— 19. Surirella insignis, sp. nova — 216 



— 20. Nitzschia marginulata Grun., var. gemiina Grun. forma minuta? ... — 217 



— 21. Achnanthes septentrionalis, sp. nova — 215 



— 22. — — var. siibcapitata var. nova — 215 



— 23. Biddulphia sp - 224 



— 24. Achnanthes debilissima, sp. nova? — 214 



— 25. Fragilaria islandica Grun., var. hgperborea Cl — 220 



— 26. Nitzschia Sigma, W. Sm., var. robusta var. nova — 218 



