Abstract
The paleontological collection of the Regional Museum of Dr. B. Horak at Rokycany was during the last 15 years remarkably extended by new graptolites from the Lower Ordovician of Bohemia. The collection contains more than 2200 specimens, out of which 107 are type individuals. The material from the Klabava Formation (Arenigian) obtained especially from outcrops studied systematically in the wider vicinity of Rokycany is most abundant (1900 items). The specimens from borings and dug pits located in the same area are less frequent. The material from the Sarka Formation (Llanvirnian) - about 300 items - comprises specimens preserved in concretions (the classical localities of Osek, Dily etc.), and shales (Rokycany-Drahous, Myto-Svatostepansky pond, Kamenny Ojezd etc.). Graptolites coming from Dobrotiva Formation (LJandeiJo) are subordinate. Except for a few specimens from the classical localities of Ejpovice (clay shales) and Osek (concretions), the remaining material was obtained from the borings drilled at Bl'ezimi, north of Rokycany. The holotypes, lectotypes, neotypes and specimens determined on the generic level are figured on the platlls.
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