The article follows on an earlier publication by the author devoted to the urban development of Małopolska under Boleslaus the Modest (Krasnowolski, 2004–2005, pp. 36–37, 38–39). At the same time, it expands the subject discussed by the author in another work several years ago (Krasnowolski, 2004). The period in question was actually a quarter of a century from 1279 to 1306. The first of these dates marks the start of the reign of Leszek the Black (Leszek Czarny), successor to Boleslaus the Modest (Bolesław Wstydliwy), and the latter — capture of Kraków by Ladislaus the Elbow–High (Władysława Łokietka), efficiently competing with the rulers of Bohemia and exploiting the death of Wenceslaus III of Bohemia (Wyrozumski, 1992, pp. 200–201). Urban development from the time can be considered continuation of the urban development policy of Boleslaus the Modest, yet at a lower dynamic, due to political instability.

For the first time, articulated shells of Anomia ephippium Linnæus, 1758, the bivalve species widely distributed in the Egerian–Late Badenian (latest early Oligocene to late middle Miocene) in the Central Paratethys, are described and illustrated. The most astonishing fact is the presence of a heavily calcified byssus that anchored the animal to hard substrates, which is still preserved inside the byssal notch. The investigated material derives from the Badenian (middle Miocene) Niskowa Formation in the Nowy Sącz Basin, a small intramontane basin situated in the Polish Outer Carpathians. Apart from articulated shells and left valves, the collected material contains some dozen of calcified byssi fixed to rigid substrate, SEM images of which are presented. Examination of the A. ephippium specimens stored in the Polish Academy of Sciences, Museum of the Earth in Warsaw revealed other Paratethyan records of anomiid calcified byssi attached to other specimens of A. ephippium. Finally, the paper provides an overview of the previous studies on the representatives of the genus Anomia Linnæus, 1758 from the Central Paratethys and its specific assignment.