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Transverse serial sections in a shell MNHN.F.A70937 of Cyclothyris vesicularis (Coquand, 1860) from the Campanian (measurements: 22.3 mm in length, 28.0 mm in width and 17.6 mm in thickness). Internal characters from the posterior shell till the level of the crura. Line drawings: D. Gaspard.
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