The mantle cavity seen here is still transparent. Left: The tree-like structure is one of two ctenidia used for gas exchange. The bubble on the left side is the beginnings of the reproductive and gastrointestinal tracts and organs. The distictive large black spot is probably the inksac! The heart is visible as the blob between the ctenidium and the ‘gut’. It was beating regularly. Right: The structure of the epidermis is visible , and the chromatophores are in focus. Credit: N Webster



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