44 Troiiiso Mu^^eniiiR Aarshofter 25. — 1902. 



extinct in the fiords at Tromsø in recent times shows, 

 that in the postglacial times, when those species were liv- 

 ing at the place, there must have been a milder and 

 more marked insular climate at Tromsø than now. 



By dredging in the deep water channels the dredge 

 will sink down into the loose mud, which is found there. 

 Therefore the mud, which is fished up in the dredge, has 

 probably its origin from a little deeper stratum under 

 the surface of the mud of the bottom. The Foraminifera 

 found in this mud will therefore for a great part be fos- 

 sil or subfossil. There are altogether around Tromsø found 

 84 species of Foraminifera, of which 39 in the glacial and 

 postglacial deposits. Those ?)9 species are all except 4, 

 found in the recent deposits at Tromsø. Those 4 species 

 may most likely by a more exact examination also be found 

 in the recent deposits. 



What seems especially to characterize the glacial and 

 postglacial deposits around Tromsø is the occurrence in 

 great quantities of comparatively small specimens of Fo/y- 

 stoniella sti^iatopiDictata var. iiicerta of a diameter seldom 

 exceeding 0.3 to 0.4 millimetres, as also the appearance of 

 Pitlvimtliiia karsieniiawdi Polystontella arctica with double 

 rows of pores only near the wnbi/ic/is, and still more the 

 appearance of N^ouiojiiiia scap/ia, Cûssid/i/ij!a crassa and 

 Virgidina schreibersiaiia. Those specimens appear indeed 

 in great quantities also in the recent deposits in the Bals- 

 fiord, but they are here possibly washed out from postgla- 

 cial clay beds. In the recent deposits in the Balsfiord, but 

 not farther out at sea, occur in cjuantities Spiroplecta bi- 

 for}7iis and A^odiili7ia arctica. The occurrence of Globi- 

 gcrina bitlloides is of interest in the postglacial deposits 

 in the Balsfiord. Those arc not found in the recent depo- 

 sits in this fiord. 



