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 Krakow-Czestochowa Highlands and in the north-eastern margin of the Holy Cross Mountains (Góry Świętokrzyskie) are given. Methods of investigation, terminology, ontogenetic changes of rostrum, stratigraphic and geographic distribution of the species are described and examples of the rostral deformation and destruction discussed.