47 
tured, apparently carried thither by the east-icelandic polar current. 
Ås the Wyville Thomson ridge is one of the most thoroughly 
investigated areas within the north-atlantic region, it cannot be a 
casualty that the species has never been found here. It is also 
absent from the area within the 200 m line around the coasts of 
Iceland. We find similar facts as to the occurrence off the west 
coast of Greenland, where the species has only been found out- 
side the coastal banks and in the deep open inlets of the coast. 
The "Tjalfe" expedition has brought up an enormous material 
of this species, often several thousands of specimens in a single haul. 
In the Atlantic it was taken in most of the hauls both in the 
spring and in the autumn; it was present in every depth, in small 
numbers at the surface, in great abundance in the deeper strata. 
Also in the Davis Strait Eukrohnia hamata was found in large 
quantities. In the southern part of that water it was found nearer 
to the surface than in the northern part. By far the greatest part 
of the individuals keep themselves in the strata, where the salinity 
is about 34 9/00 or more (compare p. 26 about the depth in which 
the salinity of 34 %00 was met with a different latitudes in the 
Davis Strait). "Only at one occasion chaetognaths are noted as 
found at the surface in the Davis Strait, viz. at stat. 329—330 
(Lat. 629 36” N, Long. 54? 12” W) on May 6th 1909, when. some 
few fsmall Sagittas", i. e., probably, E. hamatla, were taken at the 
Surface at a salinity of ca. 33.9 ”/oo. As a matter of fact, the ver- 
tical distribution of Æ. hamata in the Davis Strait indicates very 
clearly a dependence on the salinity of the water. -— It will be 
remembered (see p. 42) that some specimens of Sagitta maxima 
were captured at stat. 30 with 70 m wire at a temperature of — 
0'.5 and a salinity of 33.5 %/oo, while at the same place a large 
number of specimens were taken by a haul with 500 m wire. Ås 
to the occurrence of E. hamata at this station we find correspond- 
ing facts: by the haul with 70 m wire about 185 specimens were 
Captured, while the haul with 500 m wire brought up about 1450 
Specimens; in both cases the duration of the haul was 30 min- 
utes. — If the "small Sagittas" mentioned in the journal from stat. 
34 (western slope of Fylla's bank) belong to E. hamata we have 
here another case of the species being captured at negative temp- 
erature (ca. — 09.2) and comparatively low salinity (ca. 33.2 "/oo). 
