LIST OF ILLUSTRATIONS. 



FUi PAGE 



1. LEGS OF BIRD AND CHICK .... , . 9 



2. MEDUSA, TIAEOPSI.S DIADEMA 31 



3. STAURIDIUM. MEDUSA, CLADONEMA RADIATUM ... 43 



4. SPERMATOZOA 45 



5. SECTION OF LARVA OF CALCAREOUS SPONGE .... 51 



6. EMBRYO OF HYDROPHILUS PICEUS 53 



7. SESSILE STAGE OF CRINOTD 56' 



8. LARVA OF CRAYFISH 56 



9. GRAPTOLITES 69 



ro. TRILOBITES REMIPES 70 



n. 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 ASCI DI AN 253 



24. FULL-GROWN ASCI DI AN 255 



25. IMPRESSION OF TAIL OF ARCH.EOPTERYX 265 



26. SKELETONS OF FEET : ANCHITHERIUM, HIPPARION, HORSE . 274 



