642 DEPTHS OF THE OCEAN chap. 



biloba and G. tnincata, Agalmopsis elegans, Physophora 

 hydrostatica {borealis), and Arachnactis albida. Since then 

 many records of Atlantic forms occurring on the coast of Norway- 

 have been pubHshed, and Collett ^ has collected many such 

 records referring to fishes. Similar information has been 

 gathered in Sweden, Denmark, and Germany. I give here 

 some of these records, without any claim to completeness. 



Oi Foraminifera, the majority of which are oceanic forms, 

 Globigerina bulloides is always found in the Gulf Stream off 

 the coast of Norway. 



Surface Radiolarians (Acantharia), and also Atlantic deep- 

 sea species of the same group, sometimes occur, for instance, 

 Challengeridae, Medusettidae, and Arachnosphseridse. Jorgen- 

 sen has greatly contributed to our knowledge on this group 

 of animals. In the Skagerrack, Atlantic Radiolarians have also 

 been found by Aurivillius. 



As prominent among Atlantic Medusa taken in the 

 Norwegian Sea and fjords we may mention Atolla bairdi and 

 Periphylla hyacinthina. In May 191 1 I investigated the 

 Sognefjord, having a depth of 1000 to 1200 metres, towing 

 simultaneously a number of pelagic fishing appliances at various 

 depths, and captured more than 1000 Periphylla hyacinthina 

 of all sizes ; they occurred at all depths below 75 metres, 100 

 large and 300 small individuals being taken at 750 metres. 

 Of southern jelly-fish Cyanea lamarcki and Rhizostovia octopus 

 have been taken on the Norwegian coast ; the former is a 

 coast form and probably came from the southern North Sea. 

 Among the Siphonophores Physophora hyd^'ostatica is most 

 abundant, but the other forms recorded by Michael Sars also 

 occur." Damas has drawn attention to the importance of this 

 immigration. 



Arachnactis albida is frequently found and is a characteristic 

 Atlantic species. 



Nordgaard has recorded Atlantic Copepoda from Lofoten 

 (Pleuro7}wia robusta), and the barnacle, Lepas fascicularis, has 

 frequently been found. The southern pteropod Clio pyra7nidata 

 also occurs. Salpa fusiformis and S. mucronata occur on the 

 coast of Norway, having been recorded by many observers 

 from the south-west coast to Trondhjem fjord (Nordgaard). 



Regarding the squids some interesting information is on 

 record. Steenstrup collected information about colossal squids 



^ Collett, Meddelelser om Norges Flske (Kristiania, 1902- 1905). 



^ See Damas in Report on Norwegian Fishery and Marine Investigations, vol. ii. No. i, 

 1909. 



