LIST OF ILLUSTRATIONS. 



FIvi PAGE 



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 .... 51 



6. Embryo of Hydrofhilus Piceus ...... 53 



7. Sessile Stage of Crinoid 56 



8. Larva of Crayf'ish 56 



9. Graptolites , 69 



10. Trilobites remipes 70 



11. Pal^oniscus 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 « • . . 208 



18. Amblystoma 209 



19. Ammonites Humphresianus ...."... 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 



B5. Impression of Tail of Arch^opteryx 265 



a6. Skeletons of Feet : Anchitherium, Hipparion, Horse 274 



