hi 
and on one occasion I found a cyst in the mucus of the nostril 
of this fish. Johnstone- has recorded these cysts from various 
gadoids from the Lancashire coast. 
The worm when pressed out of the cyst corresponds in almost 
every particular with G. gracileseens (figs. 2-3), the reproductive 
organs, however, not being fully developed. This and the fact 
that the Angler is frequently seen with Haddock, Cod and Whiting 
in its mouth and stomach makes it almost certain that the encysted 
worms are the larval form of G. gracilescens. The cyst is thin- 
walled and measures 0-6 mm.; in it is curled up the larval worm 
winch is quite colourless, the most conspicuous feature being the 
opaque excretory vesicle. The worm itself when pressed out of 
the cyst is about 2-5 m.m. long. Intermediate stages between this 
and the adult are found throughout the intestine of the Angler. 
The suckers, intestine and excretory vesicle are like G. gracilescens, 
also the testes and cirrus sac, which are well developed. The 
ovary is smaller, and a simply coiled uterus can be made out. In 
some specimens the beginning of the vitellaria is seen, but these 
are not usually developed. We are, I think, justified in taking the 
Me history of G. gracilescens to be the following : First host 
Cardium edule; intermediate hosts, Haddock, Cod and Whiting; final 
host, the Angler All of these stages from the hosts quoted have 
been found on this coast, and the worm is extraordinarily abundant 
--the most abundant, certainly on this coast, of all the Trematodes 
Gen vs—Prosorliynchus (Odhner) 
^F^ArT^ ^ Ham ^ us < 0dl ^r). (Plate!, fig. 4.) Odhner, 
rauna Arctica,' page 297. 
in J,f /r't* , ' laS bee " reC01 ' M ** Nico11 1 fr0 '» st Andrews 
» the 1 ather Lasher, Com* Ml „„;<, „ m , Montagu's Sucker. It is 
Nl!T* ° f e BuUHead ' UriD « Uri* Ci eca, anc 
a """ Uo " s " Ti "" s " *»■ 
« k ■nnrmsi ibbb Helmut tkf&uns, l;S7G." 
