LIST OF ILLUSTRATIONS. 



Kentish Plover with Eggs and Young Frontispiece 



1. Spiracles and Air-tubes of Cockroach 



2. Gills op Mussel 



3. A Cell greatly magnified 



4. Amceba 



5. Egg-cell and Sperm-cell . . 



6. Diagram op Circulation 



7. Protozoa 



8. Hydra Virides 



9. Aurelia : Life-cycle 



10. Liver-Fluke — Embryonic Stages 



11. Diagram of Development .. 



12. Wing of Bat (Pipistrelle) 



1 3. Variations of the Noctule 



14. „ „ Long-eared Bat 



15. „ „ Pipistrelle 



16. „ „ Whiskered Bat 



17. Variations adjusted to the Standard of the Noctule 



18. Caterpillar of a Moth on an Oak Spray 



19. Locust resembling a Leaf 



20. Mimicry of Bees by Flies 



21. Egg and Hen 



22. Stag-Beetles 



23. Tactile Corpuscules 



24. Touch-hair of Insect 



25. Taste-buds of Babbit 



26. Antennule of Crayfish 



27. Diagram of Ear . . 



28. Tail of Mysis 



29. Leg of Grasshopper 



30. Diagram of Semicircular Canals 



3 



4 



11 



12 



13 



23 



38 



43 



45 



47 



51 



64 



67 



68 



69 



70 



73 



S5 



86 



91 



141 



ISO 



247 



248 



250 



259 



263 



266 



266 



270 



