This report is the fourth part of the monograph of the surprisingly rich assemblage of gastropods occurring in the socalled Pleurotoma Clays of Middle Miocene (Badenian) age, exposed in the environs of Korytnica in the Holy Cross Mountains, Central Poland. It contains characteristics of 101 prosobranch species of one family, the Turridae. Within this assemblage, five species are new for the science (including one, formerly reported from Korytnica, but determined erroneously); of the recognized species as many as 72 have not hitherto been reported from Korytnica, and 66 from the Miocene of Poland. As the new species established are: Clavatula kowalewskii sp.nov., Perrona (Perrona) czarnockii sp.nov., Turricula (Surcula) korytnicensis sp.nov., Cythara (Mangelia) cibori sp.nov., and Bela sanctacrucensis sp.nov.
