LT adle 
22 Sigurd Johnsen. 
The centre of distribution in the Eastern Atlantic seems to fall 
to the north of 40°N. Here we have the rich captures of the 
«Michael Sars” expedition on stations between 45° and 50°N. 
West of Ireland the species is common (Holt & Byrne 1911). 
In the material collected by the "Armauer Hansen” in 1913 on 
stations between 54° and 60” N., from Scotland and westward to 
abt. 30° W., M. glaciale is the only Myctophide represented with 
adult and young-fish in considerable number. South of Iceland 
the species still seems to be fairly common. According to Se- 
mundsson (1909 p. 99) it was captured by the “Thor” in 1904 
from intermediate water-layers on some deep-sea stations south- 
west of the Vestmanna Isles; further (also from intermediate 
depths) on the “Thor” stations 282 and 283, August 31th, 1904, 
west of the Vestmanna Isles at above 60—80 fathoms depth only. 
As far as I know a detailed account of this material has not 
been published. 
> kun SÅ 
In the Atlantic the propagation seems to take place in spring, 
probably varying somewhat in time with the latitude. The 
spawning does not seem to be restricted to certain areas but to 
come off within the greater part of the area from where the 
species is known. 
On the expeditions to the North Atlantic by the “Michael 
Sars” in 1910 and the "Armauer Hansen” in 1913 an ample 
material of M. glaciale was collected. I have in a previous paper 
(1918) made some use of this material when dealing with the 
significance of the light-producing organs. From the “Michael 
Sars” expedition I have measured all specimens collected on the 
stations of the northern section from July 11th to August 7th, 
— the stations situated on an average abt. 47° N. The stations 
of the “Armauer Hansen” were situated abt. 57° N.,—the dates 
from July 11th to July 28th. 
From the graph (fig. 2) it appears that the material of both 
expeditions falls into distinct size-groups. In both collections 
a group of young-fish is represented by many specimens; they 
are born in the year (group 0). The “A. H.” 0-group comprises 
specimens from 11 to 17 mm., with a maximum at 14mm. The 
