This report deals with Tanaidacea and Isopoda from coastal waters of Adelie Land (East Antarctica). Most of the specimens have been collected by P.M. Arnaud during two benthic surveys in 1961-1963 and in 1964-1965. They were sampled from various d~pths between 6 to 270 m, chiefly on sea-weeds or various sediments, sometimes in sponges or
in mud. 3 species of Tanaidacea and 29 species of Isopoda were identified. 2 new species are described : Parammunna arnaudi and Heterognathia adeliensis, the last one belonging ta a new genus.