E. 31. Kindle — Diatomaceous Dust. 



177 



report as C. Heteroporus, Ehrenb. The specimen I marked 

 as doubtful. I find several examples of it in these samples and 

 am able to recognize it as identical with the imperfect valve I 

 found in the Albatross material." 



Diatoms have not been observed before on the Bering Sea 

 ice and the recorded occurrences of these organisms on floating 

 ice elsewhere are not numerous. The careful observations of 

 Nansen* have shown, however, that the presence of diatoms 



Fig. 1. 



Fig. 1. View of an ice cake showing discoloration of front and left sides 

 by diatomaceous dirt, with pool of fresh water in the center. 



on the circumpolar ice packs is not an unusual or accidental 

 circumstance, as was formerly supposed. Many species of 

 diatoms were found by Hansen, during the drift of the Fram, 

 to be living in the shallow pools of water on the surface of the 

 floating ice cakes. Yanhoffen f found on the west Greenland 



*Fridtjof Nansen, the Norwegian North Polar Expedition, 1893-1896, 

 Scientific Results, Protozoa on the ice floes of the North Polar sea, vol. v, 

 pp. 5-6, 1906. 



fThe Norwegian North Polar Expedition, 1893-1896, Scientific Results, 

 vol. iv, 1904, p. 8. 



