Volume VII 
No. T 
MAY, 1914 
SOME LARVAL TREMATODES FROM MILLPORT. 
By marie V. LEBOUR, M.Sc., 
Assistant Lecturer and Demonstrator in Zoology, Leeds University. 
(With Plate I.) 
Introduction. 
The following work was done chiefly on material collected during 
a month’s stay at Millport in August 1913 whilst working at the 
Marine Station. I have to thank Mr Elmhirst for much help in 
obtaining material and also for giving me the first specimens of the 
larval Maritrema encysted in Ligia oceanica which he discovered in 
the genital ducts of that Isopod. This is specially interesting as it is 
the first undoubted Maritrema larva known. 
For the first specimens of the encysted Trematode from the 
Haddock’s skin I am indebted to Dr Jas. Johnstone of Liverpool. From 
further material obtained at Millport this was found to be a larval 
Opisthorchis, again the first step towards the life history of any species 
of the genus as yet described h 
In finding the young stages of Parorchis acanthus Nicoll, in the 
cloaca of the Herring Gull, together with the adults, it has been possible 
to identify the first larval stage as Gercaria morpurae sp. inq. (Lebour 
1912) from Picrpura lapillus, a specially interesting fact as it bears out 
the view that the genus Parorchis is closely allied to Echinostonmm. 
^ Liihe, Die Siisswasserfauna Deutschlands, Heft 17, Trematodes, states that the 
young form of 0. felineus (Eiv.) encysts in the muscles of Leuciscus idns (L.) and 
L. rutilis (L.) undescribed at that time (1909). 
Parasitology vii 
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