Opinion 303 Designation, under the Plenary Powers, of type species in harmony with current usage for the nominal genera Kosmoceras, Perisphinctes and Harpoceras (class Cephalopoda, order Ammonoidea) Established by Waagen in 1869
Published in Opinions and declarations rendered by the International Commission on Zoological Nomenclature, in 1954, in volume 8, issue 20, pages 273-284
Date published:1954-10-26