NOTICE is hereby given that the International Commission on Zoological Nomenclature has under consideration the following cases involving the possible use of its plenary powers for the purposes specified against each entry. Full particulars of these cases have been published in the Bulletin of Zoological Nomenclature in Double-Part 4/5 of Volume 9. (1) Astacus Fabricius, 1775 (Class Crustacea, Order Decapoda), validation of (correction of an error in Opinion 104); (2) Favus Lanchester, 1900 (Class Crustacea, Order Decapoda), validation of (correction of an error in Opinion 73); (3) flavipes Olivier, 1795, Dytiscus (Class Insecta, Order Coleoptera), validation of, by the suppression of flavipes Fabricius, 1792, Dytiscus.