339 
A LIST OF THE TREMATODE PARASITES 
OF BRITISH MARINE FISHES. 
By william NICOLL, M.A., D.Sc., M.D. 
CONTENTS. 
PAOE 
Introdiiftion .......... 339 
List of Trematode Parasites found in British Marine Fishes; 
arranged systematically ........ 343 
List of Trematode Parasites recorded from British Marine Fishes in 
British Waters; arranged according to their Hosts . . . 363 
I/ist of Trematode Parasites recorded from British Marme Fishes 
outside British Waters and hitherto not recorded from the 
British Area; arranged according to Hosts .... 363 
References to Literature ........ 372 
Introduction. 
In a recent paper (Nicoll, 1914) an account was given of the Trema¬ 
tode parasites occurring in the fishes of the English Channel, and at 
the same time an attempt was made to compare the records found in 
that locality with those in other British areas. 
As mentioned in that paper I have now been fortunate enough to 
have had an opportunity of examining, more or less thoroughly, nearly 
all the species of marine fishes frequenting British waters. In addition, 
extensive observations on the same subject have been made on the 
Northumberland coast by Miss Lebour, in the Irish Sea by Johnstone 
and A. Scott, and at Aberdeen by T. Scott. These researches have 
extended over a period of 13 years and it seems advisable that some 
summary should be made of the results obtained. An endeavour will 
be made to do so as briefly as possible in the following lists. 
It is somewhat doubtful if the time is yet ripe for an attempt at 
a complete account of the Trematode parasites of British marine Ashes, 
that is, of essentially British fishes and not of those which are only 
sporadic visitors. Nearly 100 species of Treniatodes have, up till the 
present, been recorded from British marine fishes. So far as I can 
judge from personal experience, the number of digenetic forms is not 
