Preliminaries -- Some classes of locally convex spaces -- Ultrabarrelled, ultrabornological and quasiultrabarrelled spaces -- Order-quasibarrelled vector lattices -- Countably barrelled and countably quasibarrelled spaces -- ?-Barrelled and sequentially barrelled spaces -- Countably ultrabarrelled and countably quasiultrabarrelled spaces -- Countably order-quasiultrabarrelled vector lattices and spaces -- Order-quasiultrabarrelled vector lattices and spaces