This paper consists of two parts: (I) a complete account of the life-history and a description of early stages ofMelinda cognataMeigen which I found here in Cambridge living as parasites on a common snail,Helicella virgatada Costa, and (II) a review of all observations made hitherto on the life-history of different flies feeding upon living or dead molluscs.
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D. Keilin (1919) studied this question.