LIST OF ILLUSTRATIONS 



PAGE 



1. Part of the marsupial pouch of the Red Kangaroo, with 



young attached 3 



2. Reproduction of Amoeba 5 



3. Head of an unborn Gorilla 8 



4. Head of a Human Foetus 9 



5. Head of an unborn long-nosed Ape 9 



6. Young cub of American Timber-wolf 10 



7. Three stages in the growth of Takin's horns 13 



8. Tadpole of a Frog 18 



9. Metamorphosis of an Ascidian 20 



10. Metamorphosis of the Sole 22 



11. Larvae of a Starfish 23 



12. Metamorphosis of Polygordius 25 



13. Larvae of a Gastropod Mollusc 26 



14. Larvae of the crustacean Penaus 29 



15. Larva and Pupa of Blow-fly 31 



1 6. Caterpillar and chrysalid of Privet Hawk-moth 32 



17. Larvae and Pupa of the Oil-beetle 33 



1 8. Development of a Locust 35 



19. Metamorphosis of Mexican Axolotl 60 



20. Repetition Pattern 64 



21. Bilateral Ink Pattern 65 



22. Oyster-catcher 79 



23. Young and Adult Banded Duiker Antelope 89 



24. Young and Adult Selous' Sitatunga Antelope 90 



25. Down-plumage Patterns 107 



26. Sea-urchin carrying its young 119 



27. Brittle-star carrying its young 120 



28. Male Hippocampus, showing brood-pouch 137 



29. Darwin's Rhinoderma, showing brood-pouch 141 



30. Ring-tailed Lemur carrying its young 167 



Xlll 



