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Diagrammatic figure of oyster lying in left valve of shell and dissected to show internal organs, (after Leuckart and Nitsche); a, mouth; b, stomach; c c c, intestines; d, anus; g, gills by which the animal 'breathes'; f f f, edge of mantle lobe; e e e, shell; h, abductor muscle by which the two valves of the shell are closed; i, nerve; k k, kidney; l, labial palps or mouth plates; n n, liver; o o o, ovary; p, heart in pericardisl space; r, nerve of edge of mantle

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