38 
EINAR LÖNNBERG, 
(Schwed. Siidpolar-Exp. 
always exceeding the length of the snout, sometimes equal to snout and eye together 
(in Ch. esox the longest rays of first dorsal are much shorter than snout). Anterior 
long rays of second dorsal also, as a rule, at least equal to, usually exceeding the 
snout in length (in Ch. esox they are much shorter than snout). Lower lateral line 
short, so that its length usually is contained four times or more in the distance be- 
tween caudal and eye (in Ch. esox about three times). Depth of caudal peduncle 
not contained twice its length (in Ch. esox about thrice). 
The colour of Champsocephalus gunnari does not appear to be so bright as in 
Ch. esox. It is in spirit dark leaden grey with some broad transverse black bands. 
Dorsal fins black, the others seem to have been more or less dusky, somewhat dif- 
ferent in different specimens; at least the end of the caudal is black. 
Ch. esox * 
Cham psocephalus gunn ari. 
average of 
3 sp. 
4 sp. 
Total length with caudal in mm. . . 
322 
34O 
390 
393 
400 
411 
412 
432 
436 
267,7 
CO 
Ln 
Length of head measured to the end 
of the opercular spine in % of tot. 1. 
28,2 
27,4 
26,7 
27,7 
26,8 
26,3 
28,4 
26,6 
27,5 
29,0 
28,2 
Postorbital length of head 1 » » » » » 
10,9 
10,6 
10,5 
11,2 
10,3 
10,5 
I 1,0 
IO.9 
I 1,2 
• 1,3 
10,7 
Diameter of eye ....»»» » » 
6,1 
5,3 
5,4 
5,6 
5,3 
5 , 1 
5 ,i 
5, 1 
5 ,° 
4,5 
4,4 
Length of snout ....»»» » » 
11,8 
H ,5 
H ,3 
11,5 
11,5 
I 1,2 
1 1,8 
10,9 
11,7 
• 3,3 
13, 2 
Interorbital width ...» » » » 
7 , 8 
7,3 
7 , 2 
8,o 
7,9 
7,4 
8,3 
7 , 8 
7,6 
6,3 
6,3 
Length of maxillary . . » » » » » 
13,4 
13,2 
12,8 
12,7 
13,3 
12,7 
• 3,3 
• 3 , 2 
• 3,3 
16,0 
15,9 
Distance from snout to 
first dorsal » » » » » 
25,5 
25, 0 
25,4 
24,8 
25,5 
24,3 
26,2 
24,1 
24,8 
27,9 
26,9 
Distance from snout to 
base of ventrals ...»»» ». 
27,0 
25,3 
25 p 
23,9 
24,3 
25, 1 
24,5 
25,0 
26,6 
24,9 
25,7 
Length of pectoral » » 
20,2 
18,8 
17,4 
19,1 
1 9.0 
19,7 
19,9 
17, 8 
20,9 
16,0 
1 5=8 
» » ventral . . . » » » » » 
18,0 
16,2 
15-4 
15,0 
17,3 
• 5,3 
16,3 
14, 8 
15,4 
14,8 
• 5,5 
Depth of body ....»»» » » 
12,7 
13,5 
I 4 >° 
15, 2 
• 5,5 
14.8 
13, 8 
14,8 
14,5 
•2,9 
12.4 
Least depth of body . . » » » » » 
3,7 
4,3 
3, 6 
3,9 
4 , 1 
3,7 
4 3 
3,9 
4,0 
3,7 
3,6 
The differences between the two species Champsocephalus gunnari and Ch. esox 
appear to stand in correspondence with their habits and occurrence. The latter which 
lives in shallower water and among vegetation has brighter colours, with numerous 
spots and transverse bars etc. which pattern evidently makes it less conspicuous in 
such surroundings. Ch. gunnari again seems to live in somewhat greater depth than 
its relative. It has therefore assumed more sombre colours and acquired larger eyes 
to facilitate the discovery of its prey. The greater fins indicate probably that it 
keeps itself suspended in mid water. 
* The measurements of Ch. esox chiefly after F. A. Smitt: « Poissons de l’expédition à la Terre de 
feu sous la direction du Docteur O. Nordenskiöld ». Bih. K. Vet.-Akad. Handl. Bd. 24. Stockholm 1898. 
