26 756 Sigurd Johnsen. 
ranean race attains maturity when one year old (group I) and 
dies before reaching two years. The material from summer falls 
into two distinct groups lying in the region of abt. 14 mm. 
(group 0) and abt. 34 mm. (group I). Specimens larger than 
45 mm. are not known. 
We shall then return to M. glaciale and its occurrence 
in northern waters. The material from this area is comparatively 
poor in number, and as it moreover has been collected in various 
years it can not be used freely for a joint investigation into 
question as e. g. that of size-groups. Ås shown on the foregoing 
pages the life-history of the species in the Atlantic exhibits a 
marked regularity. Even a smaller number of individuals, origin- 
ating from various years, may therefore be used collectively as 
a provisional starting-point for a comparison with the larger 
Atlantic material and may thus give some elucidation on the 
questions here considered. 
From the Faroe Channel are known the smallest specimens, 
larval as well as postlarval stages, taken in July—August; they 
may thus be referred to the group 0 of the Atlantic collections 
from summer. On the transition to group I is the catch of 
young-fish off the coast of Nordland (p. 7) where on December 8 
abt. 50 young-fish were taken, length from 14 to 22 mm. with 
a maximum at 16—17 mm. To the group I belong some of the 
“Armauer Hansen”’s catches in May in the southern part of the 
Norwegian Sea (Nos 2 and 3 p. 10) where 7 specimens were 
captured, 17—27 mm. The group II is inter alia represented by 
the specimens caught in young-fish trawl by the “M. Sars” in 
Hjørundfjord (Coast of Romsdal 2a and 26 p. 6): On July 
5th 1900 five specimens from 51 to 59 mm., and on November 
26th 1906 three specimens from 49 to 58 mm. Very remarkable 
are also the captures of the “Arm. Hansen” in the Mangerfjord 
(p. 5). First, that by means of trawl, — a gear not very suitable 
for capturing pelagic fishes —, as many as four specimens were 
caught, and secondly the extraordinary size of the specimens, 
69 to 76 mm. 
From the Norwegian Sea and the Norwegian area are thus 
known specimens belonging to group 0 as well as the groups I 
and II of the said Atlantic material. In addition to this some 
still larger individuals are known which in all probability must 
