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21 S., 7 Abb., Sprache: Deutsch Gewicht in Gramm: 500.

Couverture souple. Zustand: bon. RO20275174: 20234. In-4. Broché. Etat d'usage, Couv. convenable, Dos satisfaisant, Quelques rousseurs. 200 PAGES - texte sur deux ou trois colonnes - Nombreuses illustrations couleur, dans et hors texte. . . . Classification Dewey : 70.49-Presse illustrée, magazines, revues.

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 (Pyrénées-Atlantiques); Tritonoharpa aquitaniensis, early Miocene (early Burdigalian), Vives quarry, Meilhan (Landes); T. mariechristinae, middle Miocene (Langhian) of Gélis quarry, Le Houga (Gers); T. renardi, middle Miocene (Serravallian) of Carré or historically Carrey, Sallespisse (Pyrénées-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 (Pyrénées-Atlantiques). Les Plesiotritoninae (Mollusca, Gastropoda, Cancellariidae) de l'Eocène du bassin de Paris, du Cotentin, de Loire-Atlantique et d'Aquitaine. Les espèces de l'Éocène du bassin de Paris, du Cotentin, de la Loire-Atlantique et d'Aquitaine appartenant à la sous-famille des Plesiotritoninae sont étudiées. 8 espèces sont décrites comme nouvelles : Plesiotriton cailloelensis nov. sp., P. evanesco nov. sp., P. calciatus nov. sp. et Colubratriton garini nov. sp. du Lutétien (Éocène moyen) du bassin de Paris; P. jacquesponsi nov. sp. et P. clandestinus nov. sp. du Bartonien (Éocène moyen) du bassin de Paris, Tritonoharpa caunbonensis nov. sp. du Bartonien (Éocène moyen) de la Loire-Atlantique et Colubratriton merlei nov. sp. du Cuisien (Yprésien, Éocène inférieur) du bassin d'Aquitaine. Le matériel type de Plesiotriton volutellus (Lamarck, 1803), espèce type du genre Plesiotriton, est considéré comme perdu; un néotype est désigné. Tritonoharpa caunbonensis nov. sp. du Bartonien (Éocène moyen) de la Loire-Atlantique représente la plus ancienne occurrence de ce genre et nous permet d'étendre sa longévité. Le nouveau genre Colubratriton est proposé pour l'espèce Plesiotriton deshayesianus Beu & Maxwell, 1987; un lectotype est désigné pour cette espèce. Les espèces nouvelles Fusiaphera esus nov. sp. du Cuisien (Yprésien, Éocène inférieur) du bassin de Paris et F. kassitiana nov. sp. du Maastrichtien (Crétacé supérieur) d'Iran sont introduites. Pisanella marieastridae n. nom. est proposé 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.

This monograph of a rich fossil fauna of the Paris basin gives account of a mid-Thanetian locality. The facies changes within two quarries allow to subdivide the Châlons-sur-Vesle Formation into several subunits. Bathymetry and distance to the shore of the infralittoral sands are deduced from sediment analyses and fossil assemblage interpretations. Variations in the mixture of subautochtonous and displaced molluscs, and of infralittoral marine biotopes, shorelines and continental subenvironments suggest a transgressive-regressive local evolution. Several topics are studied in greater detail: the deformation structures on the lower sand, interpreted as seismites; the stratigraphic distribution of the foraminifera and their environmental significance; the regional interpretation of fish biodiversity (sharks, rays and teleosteans); the four main steps in changes of the molluscs assemblages, by means of specimen counting per species. Of special interest is the oyster's paleoecology (attachment on Dasycladaceae and sea-grass) and the boring predation-marks by Naticidae and Muricidae on molluscs, and their use in the reconstruction of different life-environmentsof the assemblage's components. An atlas of 33 plates shows the different facies of sand subunits, from the quarry to cleaned horizontal samples of shell accumulations, and a very complete iconography, especially of vertebrates and molluscs, of the taxa collected at Cauroy-lès-Hermonville and Prouilly (Marne). The plate captions of molluscs include systematics and ecological comments, with reference to the present distribution of related species. The palaeoenvironmental and climatic interpretations of this fossil assemblage, representative of the inner Parisian gulf of the mid-Paleocene (Middle Thanetian), are founded on the reconstruction of different shallow-water, marine sea beds, more or less influenced by subtropical sea-grass and Dasycladacean algae discontinuous cover and storm hydrodynamics. 119 pp., 22 figs, 33 pls, br. 4.

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205 p. (first paper is pages 1-180), 16, 2 figs, 41, 2 pls, 4to, paperbound. Cossmanniana. Volume 19.171 species of Conoidea are recorded from the Upper Oligocene of Aquitaine basin, accounting for nearly 14 % of all the gastropods that can be found there. Approximately 50 species were previously known from the same deposits. Out of these 171 species, 63 are described as new.