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The Cenozoic Pleiotritoninae (Mollusca: Neogastropoda: Cancellarioidea: Cancellariidae) of the Aquitaine basin, southwestern France. The Cenozoic species belonging to the subfamily Plesiotritoninae Beu & Maxwell, 1987 (Cancellariidae ) currently known from the Aquitaine Basin, southwestern France, are studied. Geological and geographical settings of the sites involved are specified. Apart from Loxotaphrus thorei (Grateloup, 1845), seven new species are described here: Plesiotriton aucoini, early Oligocene (late Rupelian) of Espibos, Gaas (Landes); P. camiadeorum, early Oligocene (late Rupelian) of Lagouarde, Gaas (Landes); P. ganensis and P. teuleraensis, both early Eocene (middle-late Ypresian, Cuisian) of La Teulere, Gan (Pyr?n?es-Atlantiques); Tritonoharpa aquitaniensis, early Miocene (early Burdigalian), Vives quarry, Meilhan (Landes); T. mariechristinae, middle Miocene (Langhian) of G?lis quarry, Le Houga (Gers); T. renardi, middle Miocene (Serravallian) of Carr? or historically Carrey, Sallespisse (Pyr?n?es-Atlantiques). Triton speciosum Bellardi, 1873 is here placed in Tritonoharpa; for Triton praetextum Bellardi, 1873 no position could be adopted for lack of good material. The species introduced under the name Tritonidea (Cantharus) aturensis (Peyrot, 1927) is here considered to be an ecomorph of the very variable species Loxotaphrus thorei (Grateloup, 1845), besides L. thorei morph thorei, L. thorei morph estotiensis and L. thorei morph laevis. Loxotaphrus abnormis (Bayan, 1870) is considered to be different from L. thorei, but Loxotaphrus subtaurinensis (Vergneau, 1965) is considered to be a synonym of L. thorei. The new genus Beuella (Cancellariidae: Plesiotritoninae) is proposed for Tritonidea pisanelloides Cossmann in O?Gorman & Cossmann, 1923 of the Cuisian of Gan (Pyr?n?es-Atlantiques). Les Plesiotritoninae (Mollusca, Gastropoda, Cancellariidae) de l?Eoc?ne du bassin de Paris, du Cotentin, de Loire-Atlantique et d?Aquitaine. Les esp?ces de l?oc?ne du bassin de Paris, du Cotentin, de la Loire-Atlantique et d?Aquitaine appartenant ? la sous-famille des Plesiotritoninae sont ?tudi?es. 8 esp?ces sont d?crites comme nouvelles : Plesiotriton cailloelensis nov. sp., P. evanesco nov. sp., P. calciatus nov. sp. et Colubratriton garini nov. sp. du Lut?tien (?oc?ne moyen) du bassin de Paris; P. jacquesponsi nov. sp. et P. clandestinus nov. sp. du Bartonien (?oc?ne moyen) du bassin de Paris, Tritonoharpa caunbonensis nov. sp. du Bartonien (?oc?ne moyen) de la Loire-Atlantique et Colubratriton merlei nov. sp. du Cuisien (Ypr?sien, ?oc?ne inf?rieur) du bassin d?Aquitaine. Le mat?riel type de Plesiotriton volutellus (Lamarck, 1803), esp?ce type du genre Plesiotriton, est consid?r? comme perdu; un n?otype est d?sign? Tritonoharpa caunbonensis nov. sp. du Bartonien (?oc?ne moyen) de la Loire-Atlantique repr?sente la plus ancienne occurrence de ce genre et nous permet d?tendre sa long?vit? Le nouveau genre Colubratriton est propos? pour l?esp?ce Plesiotriton deshayesianus Beu & Maxwell, 1987; un lectotype est d?sign? pour cette esp?ce. Les esp?ces nouvelles Fusiaphera esus nov. sp. du Cuisien (Ypr?sien, ?oc?ne inf?rieur) du bassin de Paris et F. kassitiana nov. sp. du Maastrichtien (Cr?tac? sup?rieur) d?Iran sont introduites. Pisanella marieastridae n. nom. est propos? en remplacement de Voluta fusiformis Defrance, 1829 non Brocchi, 1814 nec Turton, 1819 nec Swainson, 1822. 64+56 pp., 14+6 figs, 7+6 tabs, 13+12 pls, br. 4. …