"Thors T of 
Station No.  Vat.N.  Long.W. es" apr ge Ng 
D. 5rd Pupal Stage. in Metres in Metres 
152. 65? 00' 289 10' 1240 500 19/1, 4. 
285. 629 49" 189 46' 1000 ? 1lg 04. 
88. 559 05" 128 29' 2000 100 221, 06. 
80. 51? 34" 11954 1140 500 161, 06. 
175. ed it: 119 41" 575 100 301. 06. 
76. ri 189 38' 2600 400 11/8 06. 
93 (2 spec.) eft 23' 122 20" ca. 1300 100 5lg 05. 
E, 4th Pupal Stage. 
230. 639 10' AP BI 1090 600 3/g 04. 
88. 552 05' 122 20' 2000 100 Sig 06, 
76 (3 spec.). 499 27" 139 38' 2600 400 11/g 06. 
93 (7 spec.). 49? 23' 129 20' ca, 1300 100 Sl 05. 
I. The Parasitic Copepod. 
1. The adult female (Pi. I, Figs. 7—10). 
The female parasite 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, mostly less 
than 30 mm. In most cases the parasite is seen projecting from 
the dorsal part of tbe fish (i. e. above 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). With 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, especially 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 
