COLOUR PATTERN OF NATICOPSIS PLANISPIRA (NERITIMORPHA, GASTROPODA) SHELL FROM UPPER CARBONIFEROUS OF UPPER SILESIAN COAL BASIN, SOUTHERN POLAND
Wojciech KRAWCZYŃSKI
Department of Palaeontology and Stratigraphy, Faculty of Earth Sciences, University of Silesia, Będzińska 60, 41-200 Sosnowiec, Poland; e-mail: wojciech.krawczynski at us.edu.pl
