322 
ON THE ENTOZOA OF FISHES FROM THE 
FIRTH OF CLYDE. 
By WILLIAM NICOLL, M.A., D.Sc., M.B., Ch.B. 
(From the Gatty Marine Laboratory, St Andrews, and the Lister 
Institute of Preventive Medicine, London.) 
(With Plate XXIX.) 
CONTENTS. 
PAGE 
Introduction.322 
Systematic Section. Trematodes ...... 325 
Cestodes ....... 355 
List of fishes examined, with their parasites .... 355 
References ........... 358 
Introduction. 
The material on which the following notes are founded was collected 
during a short residence at the Marine Biological Laboratory, Millport, 
in August, 1908. A comprehensive survey of the marine fauna was 
impossible in so limited a time, but a fair idea of the parasites of some 
of' the common fishes was obtained. I have to thank the Government 
Grant Committee of the Royal Society for enabling me to undertake 
this work. It is also necessary to gratefully acknowledge the courtesy 
of several members of the West of Scotland Marine Biological Association 
and of Mr Elmhirst, the director of the Millport Laboratory. 
A considerable experience on the East coast of Scotland has 
shown that many species, particularly of Trematodes, common in 
certain regions along the western shores of Europe never occur in the 
fishes obtained from the Scottish part of the North Sea. For instance 
Peracreadium genu (Rud.), Peracreadinm commune (Olss.), Lebouria 
alacris (Lss.), Helicometra pulchella (Rud.), Prosorhynchus crucibulum 
