vjo 



DISCOVERY REPORTS 



7 



/o 



Mean frequency per cent of "other species", all Blue and Fin whales: 



Cocconeis imperatrix 10-5 Gyrosigma arcticum 3-9 



Navtcula sp.} 10-5 Lycmophora lynghyei 11-8 



February and March, 1931 



During this period 84 whales were taken, and 83 examined externally. Of these 19 were Sei 

 whales, three Humpbacks, and one a Sperm (^. The remaining 60 were all Blue and Fin whales. 



Of the 19 Sei whales, seven were ^t^ and 12 $?. Diatoms were visible to the naked eye on i $ 

 only, on the snout. Microscopic examination showed immense numbers of developing spores of 

 Cocconeis ceficola, with few adult frustules, and odd individuals of Navicula sp. ? and Lycmophora 

 lyngbyei. On 12 other Sei whales examination showed that diatoms or their spores (on 6 $$ and i ^ 

 in very large numbers) were present. The spores were clearly recognizable as those of Cocconeis 

 ceticola, and in all but four cases a few adult frustules of that species were also present. 



Upon a Humpback ? film composed of C. wheeleri was present, and on the Sperm ^ developing 

 spores and a few adult frustules of C. ceticola, and also Navicula sp. ? were found. 



Total Blue and Fin whales ... 60 



With diatoms 

 With thick film 

 With "other species" 

 With spores 



51 

 23 

 10 



33 



850 % 

 38-3 

 16-7 

 550 



Mean frequency per cent of "other species", all Blue and Fin whales: 



Cocconeis imperatrix 3-3 Gyrosigma arcticum 1-7 



Navicula sp. ? 6-7 Lycmophora lyngbyei 3-3 



