Descent with modification 1 Desert animals, colour of 4 _Dictyoceras_ 57 _Dictyophimus_ 57 _Diphyes_ 63 Disease, markings in 39, 44 Distant, W. L., on Malayan butterflies 80 Distinctive Colouration 3 Dogs recognising portraits 32 _Dracæna ferrea_ 96 Elephant, increase of 2 Engelmann on _Euglena_ 34 Epidermal colour 72 _Eresus cinnabarinus_ 82 _Eucecryphalus_ 57 _Eucrytidium_ 57 _Euglena viridis_ 34 Evolution 1-98 Eye-spots 45, 47 Fayrer, Sir W., on snakes 89 Feathers 91 Fishes, colours of 88 Foal, stripes on 46 _Foraminiferæ_ 56 Fuller, W. J., on aquatic larvæ 77 Gamopetalous flowers 96 Gegenbaur's "Comparative Anatomy" cited 82 General colouration 3 _Gloxinia_ 96 _Gomphina_ 77 _Gonepteryx Cleopatra_ 41, 42 ---- _rhamni_ 40, 42 Gonophores 52 _Grapta interrogationis_ 79 _Gregarinidæ_ 56 Guinea-fowl 91 Haagen, Dr., on colour 53, 72 Habits 8 Haeckel, Prof., on _Radiolaria_ 57 Hair and teeth, correlation of 94 Hawk moths 69 Hebrides, colours of insects in 80 Heredity 2 Herpes 40, 93 Heteromorphism 78 Higgins, Rev. H. H. 39