SEA-FISHERIES LABORATORY. 191 
The proglottides are not figured. There is no distinct 
neck in the worm, and the segmentation begins 
immediately behind the scolex. The posterior proglottides 
are much broader (in the transverse axis of the strobila) 
than they are long (in the longitudinal axis of the 
strobila), and their anterior extremities are narrower than 
the posterior ones, so that the edge of the strobila appears 
to be serrated. Secondary segmentation of the proglottis 
often occurs. According to Linton,* the “cuticle is 
covered with minute spines,’ but I can see nothing of 
this kind in the specimens before me. ‘The genital 
openings are in the middle line of the proglottides, but 
near the anterior borders of the latter. 
Zoogonoides viviparus (Olsson). 
A large plaice caught in Luce Bay in October, 1908, 
died shortly after it had been put into the tanks at Piel. 
It was 58 cms. in length, and was 18 or 14 years of age. 
On dissecting it, about a dozen Trematodes were found 
in the hind-gut, quite near to the anus. They were pale 
yellow in colour when alive, very small, and just visible 
on close examination without a lens. The measurements 
were :— 
Length: 1:03 mm. 
Breadth: 0°33 mm. 
Transverse diameter of oral sucker: 0°12 mm. 
2 ss ventral sucker: 0°19 mm. 
There was very little variation in size. 
The worm is not figured here. The skin of the 
part of the body in front of the ventral sucker was covered 
with short straight spines. There is a very small pharynx 
and no very conspicuous oesophagus. The intestinal 
* << Parasites of fishes in the Woods Holl region.” Hall. U.S. Fish 
‘Commission, Vol. XIX, p. 478, Washington, 1899 (1901), 
