LIST OF ILLUSTRATIONS
1. The relations between ontogeny and phylogeny. From W. Garstang in Journal of the Linnean Society of London, Zoology, vol. 35, 1922, by permission of the Councilpage10
2. Diagram of the relations between ontogeny and phylogeny " 38
3. The young and adult forms of three flies, to show the similarity between the adults and the differences between the young. After L. C. Miall, The Natural History of Aquatic Insects, by permission of Macmillan & Co., Ltd. " 46
4. Larval divergence in Polygordius. (a) trochosphere of P. lacteus and neapolitanus. (b) Larva of P. lacteus. (c) Larva of P. neapolitanus. (d) Young metamorphosed worm of P. lacteus and neapolitanus. After R. Woltereck, in Archiv für Entwicklungsmechanik, vol. 18, 1904 " 49
5. An embryo of a chick compared with that of a human being, to show the similarity between the young of animals whose adults are markedly different. After Haldane and Huxley, Animal Biology, and by permission of the late Professor Arthur Thomsonfacing page52
6. The development of the mandible in Elephas. From N. B. Eales, in Proceedings of the Zoological Society of London, 1931, by permission of the Councilpage55
7. Stages in the development of the limpet. From W. Garstang, The Origin and Evolution of Larval Forms, by permission of the British Association for the Advancement of Science " 58
8. Copepodid and adult stages of Achtheres. After W. T. Calman, Crustacea, 1909, by permission of A. & C. Black, Ltd. " 65
9. The angle which the head makes with the trunk in embryo and adult dog and human being. From L. Bolk, Probleme der Menschwerdung, 1926 (Gustav Fischer, Jena) " 69
10. The foot in foetal and adult macaque and man. Partly after A. H. Schultz, in Proceedings of the American Philosophical Society, vol. 94, 1950 " 72
11. A comparison between the larva of an echinoderm and the form of a typical primitive chordate. After W. Garstang, in Quarterly Journal of Microscopical Science, vol. 72, by permission of the Editors " 77
12. The larval form of a Myriapod soon after hatching. From vom Rath, Berichte der Naturforschenden Gesellschaft zu Freiburg i. B., vol. 5, 1891 (Paul Siebeck) " 81

-xi-

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Embryos and Ancestors
Table of contents

Table of contents

  • Title Page iii
  • Preface v
  • Contents vii
  • List of Illustrations xi
  • I- Stages of Development And Stages of Evolution 1
  • II- Ontogeny 14
  • III- The Speeds of the Processes Of Development 22
  • IV- Phylogeny 29
  • V- Heterochrony 34
  • VI- Caenogenesis 40
  • Conclusion 51
  • VII- Deviation 52
  • Conclusion 61
  • VIII- Neoteny 63
  • Conclusion 90
  • IX- Vestigial Structures Due To Reduction 92
  • X- Adult Variation 97
  • XI- Vestigial Structures Due To Retardation 99
  • XII- Hypermorphosis 100
  • XIII- Acceleration 104
  • Conclusion 110
  • XIV- Paedomorphosis And Gerontomorphosis 111
  • XV- Repetition 125
  • XVI- Embryology and Taxonomy 134
  • XVII- Embryology and Homology 146
  • XVIII- The Germ Layers 154
  • Conclusions 168
  • XIX- Conclusions 170
  • Bibliography 175
  • Index 191
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