Two monocelidid species from eastern Australia are described.Necia boreoceloidesn. sp. is characterized by an extremely elongated, adhesive tail, and further distinguished from the only known congeneric species by details of the reproductive system. A Gondwanian origin of the genusNeciais proposed.Pseudomonocelis hoplitesn. sp. differs from congeneric species by the presence of an accessory organ provided with a stylet. The definition of the genusPseudomonocelisis accordingly modified.