LIST OF ILLUSTRATIONS. 



1. Legs of Bird and Chick . , 



2. Medusa, Tiaropsis Diadema 



3. Stauridium. Medusa, Cladonema Ra!v\tl 



4. Spermatozoa .... 



5. Section of Larva of Calcareous Sponge 



6. Embryo of Hydrophilus Piceus 



7. Sessile Stage of Crinoid . 



8. Larva of Crayfish . 



9. Graptolites 



10. Trilobites remipes 



11. Pal^oniscus 



12. Larva of Echinoderm 



13. Larva of Sea-Snail . 



14. Stauridium. Cladonema . 



15. Hydractinea carnea . 



16. Larva of Parasitic Crustacea 



17. AXOLOTL 



18. Amblystoma 



19. Ammonites Humphresianus 



20. Ancyloceras 



21. Section of Larva of Calcareous Sponge 



22. Larva of Lancelet . 



23. Larva of Ascidian 



24. Full-grown Ascidian . 



25. Impression of Tail of Arch.eopteryx 



26. Skeletons of Feet : Ancihtherium, Hipparion, [ 



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