Abstract
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.

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