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Cyttarocylis ampulla (forma cassis)
A morphological variant of Cyttarocylis ampulla. Formerly known as Cyttarocylis cassis (described by Ernst Haeckel in 1873), now as Cyttarocylis ampulla. Lugol's-fixed specimen from the Bay of Villefranche found Jan. 20, 2014. Z-stack of images made using a 20 x objective and DIC optics.