21 
In spite of the difference as to the distribution and habits of 
the species, it may be of interest to make some general remarks 
regarding the occurrence of the chaetognaths within the area investig- 
ated. In the journal of the expedition we will find valuable details 
for this subject. 
But before I enter upon the matter I shall give a short account 
of the hydrographical conditions of the Davis Strait and adjacent 
waters, based on the hydrographical journal of the expedition (lent 
to me for the purpose by Dr. I. N. Nielsen) and the summary 
given by Dr. Nielsen in his reports to the government.7”) 
The comparatively warm water-masses which spread northwards 
from the Atlantic fill up the deeper parts of the Davis Strait, but 
are, for the most part, stopped by the submarine ridge stretching 
itself from the west coast of Greenland at Holstensborg to Cape 
Walsingham on Baffin Land. This atlantic water has all through a 
temperature of about 3” C and a salinity of more than 34.5 9/00. 
North of the submarine ridge the Davis Strait and the Baffin Bay 
are frozen up in the winter time; this causes a cooling down to 
negative temperatures of a considerable water layer. During the 
Summer when the sun is above the horizon for several months, 
the surface water may attain a fairly high temperature; but from 
a short distance below the surface down to about 200 m the water 
is always very cold. Small quantities of the atlantic water pene- 
trates from the Davis Strait over the ridge into the deeper parts 
of the Baffin Bay; below the cold water of this area we find, there- 
fore, positive temperatures, though hardly more than 1" CC, being 
fairly constant during the year. 
Along the east-coast of Greenland the East-Greenland polar 
Current runs from the north towards the south carrying big mas- 
ses of ice. This cold surface-water current rounds Cape Fare- 
well and continues towards the north along the west coast of 
Greenland. In the southern part of the Baffin Bay it bends to the 
West towards Baffin Land along the east coast of which it contin- 
ues in a southern direction together with the Labrador Current. 
SJ Indberetning om Fiskeriundersøgelserne ved Grønland i 1908 og i 1909. 
e= Sens og Kundgørelser vedrørende Kolonierne i Grønland, 1909, 
Nr. 2 and Nr. 5. ; 
