5 
“Thor” s 
Station No. 
Lat. N. 
Long. AV. 
Depth of the 
Station 
Depth of the 
Capture 
Date 
D. 3rd Pupal Stage. 
in Metres 
in Metres 
152. 
65° 00' 
28° 10' 
1240 
500 
19 le 04. 
285. 
62° 49' 
18° 46' 
1000 
0 
x /9 04. 
88. 
55° 05' 
12° 20' 
2000 
100 
22 /6 06. 
80. 
51° 34' 
11° 50' 
1140 
500 
16 /e 06. 
175. 
51° 11' 
11° 41' 
575 
100 
30 / 8 06. 
76. 
49° 27' 
13° 33' 
2600 
400 
n /e 06. 
93 (2 spec.) 49° 23' 
12° 20' 
ca. 1300 
100 
5 /e 05. 
E, 4th Pupal Stage. 
230. 
63° 10' 
7° 31' 
1090 
600 
3 /s 04. 
88. 
55° 05' 
12° 20' 
2000 
100 
22 le 06. 
76 (3 spec.). 49° 27' 
13° 33' 
2600 
400 
n le 06. 
93 (7 spec.). 49° 23' 
12° 20' 
ca. 1300 
100 
5 /e 05. 
I. The Parasitic Copepod. 
1. The adult female (PI. I, Figs. 7—10). 
The female parasi te is sunk into the body of the fish, leaving 
outside of the host its posterior part, which is larger or smaller 
according to the age and development of the parasite. The infested 
Scopelus glacialis are from 20 to 57 mm. in length, mostlv less 
than 30 mm. In most cases the parasite is seen projecting from 
the dorsal part of the fish (i. e. ahove the lateral line), most often 
in front of the dorsal fin (of the 22 specimens 16 penetrate dors- 
ally, of these again 13 in front of the dorsal fin; 6 are attached 
ventrally). The greater number is found on the right side (11 on 
the right, 7 on the left side, 4 just in the middle line). Witb its 
anterior part it penetrates through the body wall to the intestines 
of the host; the posterior, visible part is largest and stoutest in 
egg-bearing individuals, but the length of the hidden, internal 
part does not always correspond to that of the external: to reach 
the intestines the individuals which protrude near the dorsal 
middle line, especiallv those fixed behind the dorsal fin, have a 
longer way to penetrate than those attached ventrally. In egg- 
bearing females the external part is generally club-shaped; near 
