EINAR LÖNNBERG, 
36 
(Schwed. Siidpolar-Exp. 
tion in marmorata to be, as a rule, 3, and in a very old individual even 3V5, which 
latter may be an exception. 
For further comparison the following table of comparative measurements has 
been prepared from 6 specimens of N. marmorata representing different stages of 
growth . 
Total length without caudal 
in mm. 
72 
129 
I4O 
268 
2 So 
468 
Length of head 
in 
% 
of total 
length . . . 
30, s 
30,= 
28,9 
28,0 
31,4 
34, 2 
Interorbital width 
» 
2 
» 
» 
» ... 
8,3 
9,« 
9.6 
9,7 
10,3 
1 0,o 
Length of mandible 
» 
» 
» 
» 
» ... 
13.9 
13,9 
14 
13,8 
15,7 
17,9 
v » maxillary 
» 
» 
» 
» 
» . . . 
12,5 
12,4 
12,8 
12,3 
13,4 
1 6,0 
Distance from snout to first 
dorsal » 
» 
» 
5 > 
2 » ... 
~ 
3°! 2 
3°,o 
28,3 
O 
O 
ro 
3°, 8 
» ï » » anal 
Ï» 
» 
» 
V 
» ... 
— 
53,1 
53,6 
54,7 
57,= 
Ln 
00 
Length of ventral 
> 
ï> 
» 
» 
» ... 
22,2 
20,8 
17,9 
17, 2 
17,9 
15° 
Depth of caudal peduncle 
2> 
» 
» 
» 
» . . . 
II, i 
9*7 
1 0,0 
9,3 
10,4 
8,! 
Diameter of eye 
S> 
» 
» 
» ... 
6,9 
6,4 
6,6 
5> 2 
5,4 
4>7 
The direction of the development of some parts is made clear through this. 
Most remarkable is the increase of the maxillary and mandible with age, indicating 
that the larger specimens become even comparatively more rapacious. The distance 
from snout to anal increases also gradually with age, while the distance from snout 
to first dorsal is rather constant. The interorbital width increases, but the diameter 
of eye decreases comparatively,' as usually is the case. 
The upper lateral line has from 39 to 50 scales, the lower 14 to 17. 
The younger and smaller specimens of this fish, which live in less depth, very 
well deserve the name marmorata , as they are marbled with darker on light ground. 
Such marbled specimens may be seen with a length up to 24 cm. or somewhat more, 
perhaps, and be caught in a depth from 4 to 30 m. But in a depth of 30 some of the 
specimens are uniformly dark above, and in such a depth are found specimens which 
have attained a much greater size, from 30 to more than 50 cm. It is, however, not 
necessary that the large specimens lose their marbled colouration, as the very largest 
one in this collection has retained it. On the other hand, a specimen from station 
22 might be termed melanistic, as it is quite black above and on the sides of head 
and body, in strong contrast to the whitish belly. The two smallest specimens 
which measure with caudal about 6, resp. 9 cm. are labelled as having been “yel- 
lowish brown on the back and upper parts in general, sides and belly bright silvery. 
Iris bright silvery”. 
9. Parachaenichthys georgianus (FISCHER). 
2 specimens, Boiler Harbour, South Georgia, depth 10 m., caught on hook and 
line 1 8th of May 1902. 
