New material from the Antarctic region offers the opportunity for the redescription of two known Antarctic Corymorphidae species: Lampra microrhiza and L. parvula. The assignment of these species into genus Monocaulus (Allman 1864) (= Lampra Bonnevie 1898) is discussed. The Antarctic Monocaulus species are compared with the Arctic representatives of this genus. Descriptors: Monocaulus microrhiza, Monocaulus parvula