Direction 42: Determination of the Gender to be Attributed to the Names of Seventy-eight Genera of Various Classes of Invertebrates and of Six Genera of the Class Urochorda Placed on the Official List of Generic Names in Zoology in the Period up to the End of 1936

Direction 43: Addition to the Official List of Specific Names in Zoology (a) of the Specific Names of the Type Species of Seventy-three Genera in the Class Aves, the Names of which were Placed on the Official List of Generic Names in Zoology in the Period up to the End of 1936 and (b) of Twelve Specific Names which are Currently Regarded as Senior Subjective Synonyms of such Names

Direction 44: Correction of Certain Entries Relating to the Names of Genera in the Class Aves Made on the Official List of Generic Names in Zoology in the Period up to the Close of 1936 and Addition to the Official Indexes of Rejected and Invalid Names in Zoology of Certain Names Given to Genera and Species of the Same Class

Direction 45: Substitution of Pinnotheres Bosc, [1801—1802] for Pinnotheres Latreille, [1802—1803] (Class Crustacea, Order Decapoda) on the Official List of Generic Names in Zoology (Correction of an Error in the Ruling Given in Opinion 85)

Direction 46: Determination of the Gender Attributable to the Generic Names Achela Linnaeus, 1758 (Class Insecta, Order Orthoptera) and Geotrupes Latreille, 1796 (Class Insecta, Order Coleoptera) (Variation of Rulings Given in Opinions 299 and 346 Respectively)

Direction 47: Substitution on the Official List of Generic Names in Zoology of a Revised Entry Relating to the Generic Name Pandalus Leach, 1815 (Class Crustacea, Order Decapoda) (Revision of a Ruling Given in Opinion 104)

Direction 48: Determination of the Authorship to be Attributed to the Work Published Anonymously in the year 1798 under the Title Museum Boltenianum (Direction Supplementary to Opinion 96)

Direction 49: Validation under the Plenary Powers of the Generic Name Iphis Leach, 1817 (Class Crustacea, Order Decapoda) (Correction of an Error in the Ruling Given in Opinion 73)

Direction 50: Validation under the Plenary Powers of the Generic Name Homalaspis Milne Edwards (A.), 1863 (Class Crustacea, Order Decapoda) (Correction of an Error in Opinion 85)

Direction 51: Revision of the Entry on the Official List of Generic Names in Zoology Relating to the Name Homarus Weber, 1795 (Class Crustacea, Order Decapoda) (Revision of a Ruling Given in Opinion 104)