238 
NEW TREMATODE PARASITES FROM FISHES 
OF THE ENGLISH CHANNEL. 
By william NICOLL, M.A., D.Sc., M.D. 
{Lister Institute of Preventive Medicine, London.) 
.(With Plate XL) 
During August and September 1909 I had an opportunity, thanks 
to the Government Grant Committee of the Royal Society, of making a 
fairly comprehensive examination of the parasites of fishes from the 
English Channel at the Marine Biological Laboratory, Plymouth. 
During that time nearly five hundred fishes, belonging to about 80 
species, were dealt with and a very extensive collection of parasites 
made. A considerable number of species were obtained many of which 
are new to British waters but the number of absolutely new species 
amounted to very few. Of these I am describing here four of the most 
noteworthy, three of which appear to be of new generic type. A com¬ 
plete account of the investigations will be published later. 
Three of these species Avere rather uncommon. The fourth was 
comparatively frequent in the pipe fishes and was found in association 
with a better known species of the same genus, namely Podocotyle 
atonion. 
Podocotyle syngnathi n. sp. 
(Figs. 1, 2.) 
This species was a not uncommon parasite of the pipe fishes, 
Syngnathus acus, NeropJiis aequoreus and Siphonostoma typhle. In the 
first it occurred in four out of nine, in the second in four out of eight 
and in the third in one out of six. It was not met with in any of the 
eight specimens of Neroqohis lumbriciformis examined. Its frequency 
