Six new heteronemertean and seven new monostiliferous hoplonemertean species from the Gulf of Arabia are described and illustrated; Heteronemertini: Valencinina hubrechti sp.n., Quasiutolineides mcintoshi gen.n. sp.n., Lineus sowerbyi sp.n., Lineus schultzei sp.n., Ammolineus gaimardi gen.n. sp.n and Utolineides kenneli sp.n.; Hoplonemertini: Tetrastemma oerstedi sp.n., Tetrastemma montagui sp.n., Poseidonemertes buergeri sp.n., Poseidonemertes giardi sp.n., Verrillianemertes rathkei gen.n. sp.n., Verrillianemertes schultzei sp.n. and Quoyianemertes girardi gen.n. sp.n.