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Direction 21 Validation under the Plenary Powers of the generic names Bubo Dumeril, 1806, Coturnix Bonnaterre, 1790, Egretta Forster, 1817, and Oriolus Linnaeus, 1766 (class Aves), by the suppression of older Homonyms published by Brisson in 1760 (validation of four erroneous entries on the Official List of Generic Names in Zoology made by the ruling given in Opinion 67)
Published in Opinions and declarations rendered by the International Commission on Zoological Nomenclature, in 1955, in volume 1C, issue C.12, pages 161-178
Direction 22 Addition to the Official List of Specific Names in Zoology of (a) the specific names of fifty-seven species, each of which is the type species of a genus in the class Mammalia, the name of which was placed on the Official List of Generic Names in Zoology in the period up to the end of 1936, and (B) of the specific names of two species belonging to the same class, each of which is currently regarded as the oldest available name for the type species of a genus, the name of which was placed on the Official List in the same period
Published in Opinions and declarations rendered by the International Commission on Zoological Nomenclature, in 1955, in volume 1C, issue C13, pages 179-200
Direction 28 Addition to the Official List of Family-group Names in Zoology or, as the case may be, to the Official Index of Rejected and Invalid family-group names in Zoology of the family-group names Involved in the Cases dealt with in the Opinions included in volume 10 of the Opinions and Declarations rendered by the International Commission on Zoological nomenclature, other than family-group names already dealt with in those Opinions or in Directions included in that volume
Published in Opinions and declarations rendered by the International Commission on Zoological Nomenclature, in 1955, in volume 10, issue 21, pages 493-510
Opinion 366 Suppression, under the Plenary Powers, of the specific name multimaculata Jan, 1863, as published in the combination Crotalus lugubris var. Multimaculata, for the purpose of rendering the specific name Polysticta Cope, 1865, as published in the combination Caudisona Polysticta, the oldest available name for the Mexican Lance-Headed Rattlesnake (class Reptilia, order Squamata)
Published in Opinions and declarations rendered by the International Commission on Zoological Nomenclature, in 1955, in volume 11, issue 16, pages 231-244
Opinion 345 Rejection of a proposal for the use of the Plenary Powers for the benefit of the generic name Rhina Latreille, [1802-1803] (class Insecta, order Coleoptera) and addition of the generic name Rhina Schneider, 1801 (class Elasmobranchii) to the Official List of Generic Names in Zoology; designation under the Plenary Powers for the genera Rhinostomus Rafinesque, 1815, and Magdalis Germar, 1817 (class Insecta, order Coleoptera) of type species in harmony with accustomed usage; validation under the Plenary Powers of the specific name barbicornis Latreille, [1803-1804], as published in the combination Rhina barbicornis (class Insecta, order Coleoptera)
Published in Opinions and declarations rendered by the International Commission on Zoological Nomenclature, in 1955, in volume 10, pages 353-388
Opinion 365 Suppression, under the Plenary Powers, of the specific name cinereous le Conte, 1852, as published in the combination Crotalus cinereous, for the purpose of rendering the specific name Atrox Baird & Girard, 1853, as published in the combination Crotalus Atrox, the oldest available name for the Western Diamond Rattle Snake (class Reptilia, order Squamata)
Published in Opinions and declarations rendered by the International Commission on Zoological Nomenclature, in 1955, in volume 11, pages 215-230