Anonymous. 1956. Direction 57. Addition to the Official List of Specific Names in Zoology (a) of the specific names of forty-seven species belonging to the Classes Cyclostomata, Pisces, Amphibia and Reptilia, each of which is the type species of a genus, the name of which was placed on the Official List of Generic Names in Zoology in the prioid up to the end of 1936 and (b) of the specific name of one species of the Class Amphibia wich is currently treated as a senior subjective synonym of the name of such a species. Opinions and Declarations Rendered by the International Commission on Zoological Nomenclature 10: 365–388.