Opinion 420 Addition to the Official List of Specific Names in Zoology of the specific names for Eleven species of the class Brachiopoda and for two species of the class Cephalopoda originally published by Martin (W.) in 1809 in the nomenclatorially invalid work entitled Petrificata Derbiensia and now available as from the first Subsequent date on which they were severally published in Conditions Satisfying the Requirements of the Regies
Published in Opinions and declarations rendered by the International Commission on Zoological Nomenclature, in 1956, in volume 14, issue 4, pages 129-168
Date published:1956