Nomenclatural Note (p. 389): "Sicyonidae Hertwig, 1882 is older than Sicy-oniidae Ortmann, 1898 (Crustacea, type genus Si-cyonia Milne-Edwards, 1830). The crustacean taxon was originally spelled as Sicyoninae, but this name was placed on the Official Index of Rejected and Invalid Family-Group names in Zoology (see ICZN, 1956, Direction 54) while Sicyoniinae Ortmann, 1898 (correction of Sicyoninae Ortmann, 1898) placed on the Official List of Family-Group Names in Zoology and currently considered valid. As a result, Sicyonidae Hertwig, 1882 and Sicyoniidae Ortmann, 1898 are not homonyms because they differ in one letter (Article 55.4)."