i 
oesophagus. A third individual (still unpigmented and without eggs). 
fix ed near the back on a line with the root of the pectoral fin of 
a fish, 55 mm. in length, onlj protruded with 4,8 mm. externally, 
while 8,2 mm. were hidden in the host. It went nearly straight 
down through the muscles, curved in front of the right pronephros 
over the upper pharyngeal bones and had its anterior end lying in 
front of the left pronephros, with the sucking apparatus close to the 
jugular vein. The greater part of the internal portion of this spe- 
cimen is narrow and siender. 
In all specimens examined the anterior part sends out from 
each side a large, clumsy process, generally shaped like a cushion 
(Figs. 7, 8, pr.): sometimes more as a sausage (Fig. 10 pr.); be- 
hind the processes follows an elongated, straight or curved portion, 
tapering gradually into a stalk and at the same time acquiring a 
more and more thick cuticle; outside the host it widens — some¬ 
times abruptly — into the ovoid part, carrying the genital openings 
with the egg-strings. Behind the latter a short conical part may 
be more or less pronounced and feebly bent dorsally. 
The anterior part with the two large lateral processes is the 
cephalothorax; in front of the processes are seen two pairs of au- 
tennæ, the mouth-sipho, maxillæ and one pair of maxillipeds 
(according to some authors — the second pair of maxillæ); immedi- 
ately behind the cephalothorax a very short part of the elongated 
portion represents the abdomen (or thorax), composed of three, still 
quite discernible segments; the two anterior of these are provided 
each with a pair of feet, while an anterior pair of feet takes origin 
from the cephalothorax. By far the greatest portion of the whole 
parasite is made up by the enormously developed genital segment, 
as in other Lernæidæ ; the remaining part of the postabdomen, 
probably only representing a single segment, is the above-named 
small conical end. 
Closer examination of the anterior part shows that most of 
the Copepod-structure is pretty well preserved; the shape of the 
dorsal shield is quite recognizable; below its anterior margin a 
