ILLUSTRATIONS. 



FIG. 



1. Hydne 



2. Diagrammatic section of Hydra ... ... 49 



3. Sea-anemones ... ... 55 



4. The Bernicle Goose 



5. Group of Barnacles ... ... ... 7^ 



6. The Barnacle Tree (from Gerard's " Herball ") 81 



7. Barnacle Tree (from Munster's "Cosmography") ... 84 



8. Metamorphosis of the Frog ... 89 



9. Giant Cuttle-fish's Head ... ... 114 



10. Shells of Foraminifera ... ... I2 8 



11. A Radiolarian Shell ... ... 128 



12. A Living Foraminifer ... ... ... I2 & 



13. "Mare's-tail" Coral... 131 



14. Corals ... ... J 35 



15. Diagram of Coral-reefs ... ... ... ... I5 1 



16. Diagram of Atoll or Lagoon Reef ... I5 1 



17. Liver-fluke... ... ... ... ... . J 85 



18. Tapeworm of Dog ... ... ... .... 187 



19. Common Tapeworm ... ... ... ... ... 188 



20. Sacculina ... ... ... ... I9 1 



21. Young of Sacculina ... ... ... ... *9 2 



22. Young Barnacle ... ... ... ... ... 194 



23. Trichina imbedded in Muscle ... ... ... ... 196 



24. Trichina (female) ... ... ... 196 



25. Trichina (male) ... ... ... ... 197 



26. Demodex ... ... ... ... ... 203 



27. A Nais ... ... ... ... ... ... 207 



28. Plant-lice, natural size and magnified ... ... 209 



29. Zoophytes ... ... ... ... ... ... 212 



30. Part of a Chain of Salpae ... ... 213 



31. Single Salpa ... ... ... ... ... 214 



