52 Alf Wollebæk. [No. 12 
Growth and Maturity: With åa length of 17 mm. the Pan- 
dalus larva acquires an appearance corresponding in all essentials 
with that of the full-grown animal. The swimming-exopodites of 
the thoraeic legs, present in the earlier larva stages, have now dis- 
appeared, so that it ceases to be pelagie, and from this time forward 
its existence is confined to the bottom. 
The very smallest bottom-stages are hardly ever found in our 
ordinary fishing-apparatus, as the meshes are too wide for eatehing 
such small ereatures. However by using å fine-meshed muslin bag 
at the end of an ordinary prawn-trawl I was able to catch specimens 
25—30 mm. long in the Christiania Fiord during August, which had 
probably been hatcehed in the spring of the same year. 
In December we caught a quantity of small individuals 45—60 
mm. long, though not smaller than about 40 mm., and these too had 
in my opinion been hatehed during the spring. 
In the summer, in August for instance, we meet with large 
quantities that are for the most part about 80 mm. long. This 
average size is now attained by the bulk of the small individuals 
which in the previous winter we found had å length between 45 
—=(G0 17550 
The smallest ovigerous individuals I have caught have been 
100 mm., but by far the largest number of berried females are be- 
tween 120—160 mm.; consequently I imagine that it is not till the 
third summer after leaving the egg that P. borealis attains full 
maturity. The largest males I have found have not been over 
120 mm. 
Bathymetric Distribution, Wandering (?), &e..  Pan- 
dalus borealis has, we are informed, been found in the stomachs of 
deep-water fish taken at a depth of over 400 fathoms. In about 
200 fathoms I have myself taken it with the trawl. However, the 
enormous dquantities captured in Norse fiords are taken at depths 
not nearly so great, generally in about 60 —100 fathoms; and great 
numbers are even caught in water not deeper than about 20 fathoms. 
We have already mentioned that in the Drammen Fiord the fishery 
takes place at 28—40 fathoms, and that in that fiord the prawns 
cannot find suitable grounds at greater depths (cf. page 46). Even 
out in the Christiania Fiord, where it is ordinarily found far deeper, 
it seems to make for shallower water in the spring: and whereas 
it is usually fished for at 60—80 fathoms during the autumn and 
