The authors describe the Atrypidae from the lower and upper (Fort Hulobiet Member) members of the Fromelennes Formation and from the lower part (Pont d'Avignon and Sourd d'Ave Members) of the Nismes Formation. Four species are new: Desquamatia (Independatrypa) coenaubertorum n. sp., D. (Seratrypa) orbiculata n. sp., D. (S?) suppinguis n. sp. and D. (Neatrypa) gosseleti n. sp.; two are assigned to D. (Seratrypa) pectinata COPPER. P., 1967 and D. (Neatrypa) europaea STRUVE. W., 1964. Rare or poorly preserved specimens are provisionally designated as D. (Seratrypa) cf. pectinata , D. (S.) sp. R, D. (Neatrypa) sp.S and Spinatrypina sp. The specimens have been collected for the most part from five outcrops located at the southern and south-eastern borders of the Dinant Synclinorium. The succession of the atrypid zones at the base of the Nismes Formation in these different outcrops shows, from south to north-east, the diachronism which has been already pointed out formerly, of the base of the unit.