LIST OF ILLUSTRATIONS. 



FIG. PAGF. 



1. Legs of Bird and Chick 9 



2. Medusa, Tiaropsis Diadema 31 



3. Stauridium. Medusa, Cladonema Radiatum . . -43 



4. Spermatozoa 45 



5. Section of Larva of Calcareous Sponge . . . -Si 



6. Embryo of Hydrophilus Piceus 53 



7. Sessile Stage of Crinoid 56 



8. Larva of Crayfish 56 



9. Graptolites 69 



10. Trilobites remipes 70 



11. Pal/EONiscus . 72 



12. Larva of Echinoderm 197 



13. Larva of Sea-Snail 200 



14. Stauridium. Cladonema 203 



15. Hydractinea carnea 204 



16. Larva of Parasitic Crustacea 207 



17. axolotl 2c8 



18. Amblystoma 209 



19. Ammonites Humphresiakus 214 



20. Ancyloceras 216 



21. Section of Larva of Calcareous Sponge . . . .217 



22. Larva of Lancelet 251 



23. Larva of Ascidian 253 



24. Full-grown Ascidian 255 



25. Impression of Tail of Arch^opteryx 266 



26. Skeletons of Feet : Anchitherium, Hipparion, Horse . 274 



