Ad. s. Jensen: The Selachians of Greenland. 35 



— 1,3° C), whereas the southern slope of the ridge is washed by Atlantic water with 

 positive temperatures. 



It will thus be natural to extend the "Deep Norwegian Basin" as far to the 

 south as the ice-cold bottom-water reaches, thus almost to the place where the 300 fm. 

 Hne touches the northern slope of these ridges and the banks which they connect. If we 

 now draw a line on the chart (cf. fig. 12) along this level, its course will be as follows: 

 from East Greenland over towards North-west Iceland, north round this island to- 

 wards the northern slope of the Faeroes, whereafter it bends to the south and forms 

 a curve down into the channel between the Faeroes and Shetland, then north round 

 Shetland over towards Norway, where it joins the slope from the coastal banks al- 

 most opposite Stat. 



We find similar conditions along the west of Norway, here there is a bank which 

 taken as a whole slopes gradually outwards from the land until at a varying dis- 

 tance from the coast of from 40 to 200 kilom. it dips down into the depths with a 

 more abrupt slope cailed "Eggen". Ice-cold water lies against this "Edge" at a depth 

 greater than 300 fm., whereas the over-lying, warmer Gulf Stream water spreads 

 out over the coastal banks. Thus on this side also the cold bottom-water (Deep 

 Norwegian Basin) follows nearly the curve for 300 fms. depth, from the level of Stat 

 up along the coast of Norway first in a northerly direction, then towards the north- 

 east until the Norwegian Basin almost at TO"" N. L. bends away from Norway, the 

 banks here widening out and forming the bottom of the Barents Sea, whilst the 

 "Edge" and the adjoining, ice-cold Norwegian Basin continue westward round Bear 

 Island in an almost straight line northwards to the west side of Spitsbergen ^) 

 (cf. fig. 12). 



The "Deep Norwegian Basin" is thus taken tomeanthe ocean depths which lie 

 below the 300 fm. line, abutting in the east the Spitsbergen— Norway "Edge", in the 

 south the Shetland — Faeroes — Iceland — Greenland ridge, in the west the coast of Green- 

 land; this deep basin has everywhere water with negative temperatures down to the 

 bottom (in the north-eastern part from Lofoten to Spitsbergen however the warm 

 water extends somewhat deeper down, to about 400 fm.)^). 



On an earlier occasion the present author*') has discussed the quantitative and 



') A detailed description of the physical and hydrographical conditions outlined here wi]] be 

 found in the fundamental work of H. Mohn : The North Ocean. Its Depths, Temperature and 

 Circulation (The Norwegian North-Atlantic Expedition). 1887. See also the more recent work of 

 Bjorn Helland-Hansen and Fridtjof Nansen: The Norwegian Sea. Rep. on Norwegian Fishery 

 and Marine Invest., II, No. 2, 1909. 



-) Bjorn Helland-Hansen and Fridtjof Nansen: The Sea West of Spitsbergen. Viden- 

 skapsselsk. Skrifter. I. Mat.-naturv. Klasse, No. 12, 1912. 



») Ad. S. Jensen: On the fish-otoliths in the bottom-deposits of the sea. I. Meddel, fra 

 Kommiss. for Havundersøgelser. Serie : Fiskeri. Bd. I, Nr. 7. 1905. 



6* 



