58 
The -size of the individuals in the different stages of maturity 
is very variable. As a rule the male puberty is reached when the 
specimen is somewhat more than 30 mm, but I have seen indiv- 
iduals of group lla from 27 mm and group Illb from 28 mm. 
The length of specimens of group lla varies from 27 to 42 mm 
with average length 34.3 mm. In group Ilb the limits of variation 
are 28 and 41 mm, average 34.1 mm. The average length of the 
four specimens of group Ill is 34.25 mm. The three specimens of 
group IV are 35, 41, and 41 mm. — It is evident, that the growth 
of the individudls ceases at the same time as the puberty is 
reached, and that the length of a mature Sagitla elegans (when 
preserved) is on an average 34—35 mm, but varies very much. 
A tabular view of the length of 150 specimens of group II and 
of their ovaries is given p. 37. 
Nearly the whole of the material of Sagitta elegans pilot] 
by the expedition is from the months of July and August. At most 
stations small and full-grown specimens were found together, which 
indicate that the breeding period in the Greenland waters extends 
over a considerable space of time, though the relative numbers of 
individuals of the different groups at different times seem to indic- 
ate, that the bulk of the specimens breed in the autumn. —- Three 
of the four specimens from deep water (stat. 336, May 1909) be- 
longed to the group Ill. A specimen found by Motzfeldt at 
Fiskernæs on March 15th 1914 had mature sperm, and the ovaries 
were 9 mm long. 
In the preserved material Sagitta elegans occurs from the fol- 
lowing 9 stations: 
Stat. 124, Disco Bay, Lat. 69" 17' N., Long. 52? 14 W, July 
I6th 1908, large ringtrawl, 150 m wire. — 750 specimens, .16— 
39 mm. — 247 specimens, picked out at random, were more closely 
examined, partly in xylol. They are grouped according to their state 
of maturity as follows: 
Group I 181 specim. 16—33 mm 
- Ha 28 5 2734 . ovar 26 mm 
sonb 41 98 30 > - 3—13 - 
In some of the specimens from this haul the development of 
the eggs has commenced unusually early, large eggs being found in 
