Abstract
During the ancient oceanographic expedition of the « Talisman » in 1883, several specimens of a new ascidian species of an uncommon genus of Molgulidae were dredged on a sedimentary bottom off Mauritania. This material was stored in the collections of the Muséum national d’Histoire naturelle where it was overlooked until recently. The good condition of some of them reveals original characters of the musculature and gonads compared to those of the three other species known in the genus Bostrichobranchus.References
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