INDEX 



Acquired characters, 102 

 Acrieida, warning colours in, 134, 



137 

 Acrania, 175, 188 

 Adventitious colours, 132 

 Aggressive resemblances, 122, 



131 

 Aldrovandi, 33 



Alluring resemblances, 123. 131 

 Alpaca, 7 1 



Alpine animals, colours of, 124 

 Ammonites, 57, 91 

 Amphibia, 176 



pedigree of, 176 

 Amphioxus, 188 



ancestral nature of, 189 



development of, 112 

 Ampkiuma, 167 

 Ancestral history, distortion of, 



99 



Ancestral stages, omission of, 98 



Ancon sheep, 35 



Angle-shade moth, protective re- 

 semblance in, 128 



Annelids, fossils of, 60 



Annual plant, seeds produced by, 



39 

 Anomodontia, 187 

 Antlers of deer, 93 

 Ants, variation in, 43 

 Apatetic colours, 122 

 Appendicularia, 191 

 Apple, varieties of, 46 

 Archaopteryx, 65, 181 



Arctic animals, white colour of, 



I3i, 123, 124 

 Arctic fox, colour of, 124 

 Argument from embryology, 78 



palaeontology, 53 

 Argus pheasant, epigamic colora- 

 tion of, 143 

 Aristotle, 1 



Arthropoda, fossils of, 60 

 Artificial selection, 27 

 Artiodactyla, 64 

 Ascidians, 189 



degeneration of, 191 



development of, 80 

 Aspidoceras, 93 

 Aucke?iia, 71 

 A-ues, 180 

 Axolotl, 177 

 Aztecs, 157 



Bactrian Camel, 71 



Baer, Von, 78 



Baker, Sir S., on the colour of 



the giraffe, 125 

 Balanoglossus, 158 

 Balanus, affinities and develop- 

 ment of, 82 

 Balfour, 78 

 Bantam fowl, 35 

 Barb pigeon, 28 

 Barnacles, see Balanus, 82 



monograph on by Darwin, 213 

 Bat, wing of, 164, 168 

 Beagle, voyage of, 205 



