Existence de Cirripédes acrothoraciques dés le Lias: Zapfella pattei nov. gen., nov. sp.

An account of acrothoracic cirripeds from several zones in Liassic, Jurassic, Cretaceous, and Miocene localities of France. It is tentatively concluded that a considerable variation in abundance has taken place. During the Liassic, late Cretaceous, and Miocene, conditions were more favorable for their existence than at present. A description of Zapfella pattei n.g. n.sp. is included.