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Belemnoids from the Jurassic of Poland

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29 belemnoid species (including 1 new), belonging to 12 genera and 4 subfamildes within the Belemnitidae, are described from the Middle and Upper Jurassic beds of Poland. Individual variation, ontogeny and structure of the rostra are investigated. General remarks on the Jurassic stratigraphy in the Kraków-Częstochowa Highlands and in the north-eastern margin of the Holy Cross Mountains (Góry Świętokrzyskie) are given. Methods of in vestigation, terminology, ontogenetic changes of rostrum, stratigraphic and geographic distribution of the species are described and examples of the rostral deformation and destruction discussed.
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Jurassic palecypods from Cuba

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The paper presents descriptions of 16 species of Jurassic pelecypods including 3 new- Vaugonia (Vaugonia) postutahensis sp. n., V. (V.) cubanensis sp. n. and V. (V.) cayetanoensis sp. n. - belonging to 7 families: Bakevelliidae King, Plicatulidae watson, Gryphaeidae Vialov, Ostreidae Rafinesque, Trigoniidae Lamarck, Astartidae d'Orbigny and Corbiculidae Gray. Growth changes in shells of some species, inferred mode of life of these pelecypods are discussed.
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Eleven trigoniid species of the genera Trigonia Bruguiere, Myophorella Bayle and Rutitrigonia van Hoepen, including one new species, R. skorkovensis. sp.n., are described from the Jurassic of Poland. The representatives of the genus Rutitrigonia are reported for the first time from the Lower Kimmeridgian of Poland which markedly increases the stratigraphic and geographic range of that genus hitherto considered as limited to the Upper Kimmeridgian - Upper Cretaceous of the Phillippines, Japan and the southern hemisphere.
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Jurassic Ostreidae of Poland

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Thirty five species of oyster pelecypods are described from the Middleand Upper Jurassic of Poland, belonging to 7 genera and 3 subfamilies: Ostreinae, Vialov 1936, Gryphaeinae, Vialov, 1936 and Exogyrinae, Vialov, 1936. Morphology of species, their development and individual variability are investigated. The lithological and geological relationships of the area under investigation, the influence of environment onto the shell morphology, examples of functional and structural adaptations of Ostreidae and shell microstructure are characterized. The remarks on the phylogeny of Ostreidae are completed by an introduction of two development stages: Catinula and Nanogyra. The systematic position of Nanogyra nana Beurlen, 1958 is discussed.
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Four species of plicatulas from the Middle and Upper Jurassic have been described. Their external and internal morphology, variability and ontogenetic development have been studied and their systematic and stratigraphic positions - discussed.
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Three species of Serpulidae (including a new one), belonging to three different genera which represent the subfamilies: Filograninae Rioja, Serpulinae Rioja and Ditrupinae Regenhardt, are described in the present paper. The material comes from the heap of the Boryszew (near Sochaczew) bore-hole, from depths of 193-207 m, where deposits are assigned to the boundary between Danian and Montian.
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Four species of belemnoids, one new: Belemnopsis wiekensis n. sp . from the Middle Jurassic and from lower horizons of the Upper Jurassic of Poland, belonging to the subfamily Belemnopsinae Naef, 1922, are described together with observations on the ontogeny, variability and structure of rostra.
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Neocomian oysters from Central Poland

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Fourteen species of gryphaeas and oysters of seven genera from a section ranging between the Valanginian and Lower Hauterivian have been described and the morphology, development and individual variability of their shells studied.
Praca niniejsza zawiera opis Rhopaloteuthis majeri (Alth, 1875) i Rhopaloteuthis bzoviensis (Zeuschner,1859) z keloweju i oksfordu okolic Krakowa i Częstochowy . Zbadano zmienność indywidualną , rozwój ontogenetyczny rostrum i jego budowę, Ustalono położenie komory embrionalnej i, co za tym idzie, bruzdy u obu gatunków; potwierdziło to pogląd Naefa, że rodzaj Rhopaloteuthis należy zaliczyć do podrodziny Duvaliinae.
Traces of the destructive activity of plants and animals, belonging to six species and tests of nine animals settled on pelecypod shells are described. The animals belong to the Foraminifera (two species), Annelida (five species) and Bryozoa (two species).
24 organismes sédentaires fixés sur les rostres des Bélemnites du Crétacé supérieur de Pologne sont décrits. Parmi ces organismes il y a des représentants de divers groupes d'animaux: Foraminifères - 3 espèces, Bryozoaires 7 espèces, Annélides - 3 espèces, Lamellibranches - 2 espèces, Alcyonaires - espèces et 1 organisme problématique.
Twelve species of pelecypods representing the subfamilies: Pycnodonteinae, Exogyrinae and Ostreinae are described. The growth changes in Pycnodonte (Phygraea) vesicularis and in Gryphaeostrea vomer are reported. The "fingerprint shell structure"', has been found on the shell of. P. (Phygraea) vesicularis, and it is interpretrd as the remain of conchiolihe membrane in the subnacreous layer. In earlier stages of the Upper Cretaceous in, the Middle Vistula region the ostreids dominate, while in the later ones brachiopods and belemnites are more aboundant.
Sixty Middle Jurassic species of Bivalvia from Poland including a new one (Goniomya rudnikensts sp. n.) are described and their occurrence in profile and dependence on environment are considered. It has been stated that epifaunal suspension-feeders to infaunal suspension-feeders ratio in one of the investigated profiles (Łęczyca) from the Polish Lowlands is comparable to that of the Lower Oxford Clay in England; the deposit-feeders are less numerous in the Polish profile. Ornamentation variability and anisometric growth changes as well as changes of hinge structure during ontogeny in some investigated bivalves have been noticed.
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From the Dogger deposits of Łęczyca near Kutno there are described 12 pelecypod species representing 3 genera: Trigonia Bruguiere, Myophorella Bayle, and Vaugonia Crickmay. One new species, Trigonia crebraecostata sp.n., is described. The results of studies on morphology, variability, development of shell, as well as on shell structure and microornamentation are given.
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