NOTICE is hereby given that, as from November 11, 1954, the International Commission on Zoological Nomenclature will start to vote on the following cases involving the possible use of its plenary powers for the purposes specified against each entry. Full particulars of these cases were published on May 11, 1954, in the Bulletin of Zoological Nomenclature in Parts 6, 7 and 8 of Volume 9. (1) immigrans Sturtevant, 1921 (Drosophila) (Cl. Insecta, Order Diptera), validation of; (2) pruni Geoffrey, 1762 (Aphis) (Cl. Insecta, Order Hemiptera), validation of; (3) Lachnus Burmeister, 1835, and Cinara Westwood, 1835 (Cl. Insecta, Order Hemiptera), designation of type species for; (4) Stentor Oken, 1815 (Cl. Cilio-phera), validation of, and designation of type species for; (5) Melanargia Meigen, 1828 (Cl. Insecta, Order Lepidoptera), validation of; (6) Geoffroy, 1762, Hist. abrégée; validation of six generic names (Stratiomys, Stomoxys, Volucella, Nemotelus, Scatopse, Bibio) in the Order Diptera, published in; (7) Palmatotriton Smith, 1945 (Cl. Amphibia), suppression of; (8) Ammonites mammillatus Schlotheim, 1813, designation of neotype for, and Douvilleiceras de Grossouvre, 1893, designation of type species for (Cl. Cephalopoda, Order Ammonoidea).