Abstract
On May 30th, 1916, a number of large Buccinum undatum were brought in from the trawling grounds ; 40 of these were examined and 34 were found to contain larval Trematodes. Another lot in the spring of 1917 contained about the same percentage of infected Mollusks. Two species of Trematodes were present, both contained in the digestive gland, which was absolutely riddled with them.

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