1903-1910 In issues. Contains a wealth of information on the fauna of Spanish Guinea (now Equatorial Guinea). Small monographs on: Mammals (4 col. pls), Amphibians (1 pl.), Reptiles, Arachnids, Fishes, Diplopoda (2 pls), Crustacea Decapoda (1 pl.), Molluscs and numerous insect groups like: Lepidoptera, Odonata, Tenebrionidae, Chrysomelidae, Coccinellidae, Staphylinidae, Dermaptera, Orthoptera etc.