BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND. 24. AFD. III. N:0 2. 25 



N. eostulata Grun. v 



N". salinarum Grun. r 



var. iutermedia Grun. r 



Piunularia giobieeps var. Krookii Grun. r 



Stanroneis sagitta Cl. r 



Stephanodiscus Hantzsehii Grun. r 



C. Marine forms. 



Ampliora proteus Greg., a fragment. 



Ampliiprora Kjellmanii Cl., a fragment. 



Caloneis temula A. S. r 



Coscinodiscus bathyomphahis Cl. r 



C. curvatulus var. inermis Grun. r 



C. ocnlus iridis Ehe., a fragment. 



Diploneis litoralis var. arctiea Cl. c 



Navicula algida Grun. + 



N. digito-radiata Greg. r 



N. krj^jpliila Cl. r 



N. snbinflata Grun. r 



N. transitans Cl. r 



N. valida Cl. & Grun. + 



Paralia sulcata var. radiata Grun., a fragment. 



Pinnnlaria Stuxbergii var. leptostanron Grun. r 



Tbalassiosira gravida (spores) Cl. r 



T. Nordenskiöldii Cl. r 



Fresbwaterforms .... 27. 

 Brackish forms .... 8. 

 Marine forms 17. 



These fignres prove that the ice-floe derives from the 

 month of some river, but the fresliwater-species do not in- 

 dicate the precise spöt. Some of the marine speeies are identical 

 with those fonnd on the drifting ice at Cape Wankarema and 

 along the east-coast of Greenland, bnt on the whole there is 

 a eonsiderable difference, as many of the most characteristic 

 of tlie latter were not fonnd. On the other hand there 

 is nothing against the snpposition that the mnd was de- 

 rived from the shore of the Kära Sea, which seems most 

 probable. . 



3 



