Nine specimens of sabellid and serpulid worms which had been figured by Dr. Antonín Frič in his series of publications on the strata of the Bohemian Cretaceous Basin and which are kept in the collection of the National Museum in Prague are re-described, re-figured, re-determined and discussed in detail. The specimens belong to seven species: Glomerula serpentina (GOLDFUSS), Glomerula plexus (J. DE C. SOWERBY), Filograna socialis (GOLDFUSS), Neovermilia cf. ampullacea (J. DE C. SOWERBY), Dorsoserpula wegneri (JÄGER), Dorsoserpula conjuncta (GEINITZ)?, and Serpulidae gen. et sp. indet. In addition, those species and specimens mentioned but not figured by Dr. Antonín Frič are listed and partially discussed although these specimens had not been found in the collection and are presumably lost. [ABSTRACT FROM AUTHOR]