Direction 27 Addition to the Official List of Family-group Names in Zoology of Family-group Names based upon the names of certain genera of non-marine Mollusca placed on the Official List of Generic Names in Zoology by the ruling given in Opinion 335
Published in Opinions and declarations rendered by the International Commission on Zoological Nomenclature, in 1955, in volume 10, issue 20, pages 481-492
Date published:1955-08-05