Circumbilical retractor muscle attachment areas in the upper ordovician bellerophotoidean gastropod Grandostoma grande (Barrande in Perner 1903) / Radvan J. Horný
Obsahuje též: Nonorios gen. n., a new platyceratid Gastropod (Mollusca) from the middle Ordovician of the Mediterranean Palaeoprovince /Radvan J. Horný-- Shell breakage and repair in sinuitopsis neglecta (Mollusca, Tergomya) from the middle ordovician of Bohemia / Radvan J. Horný