LIST OF ILLUSTRATIONS. 



FIG. 1'AGE 



1. Duckmole (Ornttkorhynchus) ...... 2 



2. Phenacodns, a primitive extinct Mammal (Cope) . 3 



3. Extinct moa and modern kiwi (Carus Sterne) . . 3 



4. Crocodiles ....... .4 



5. Salamander, an Amphibian ... 5 



6. Queensland dipnoan (Ceratodits) ..... 5 



7. Amphio.xits (Haeckel) ....... 6 



8. Ascidian or sea-squirt (Haeckel) ..... 7 



9. Cephalopod (paper nautilus, female) ... 9 



10. Fresh-water crayfish (Astacits}, a Crustacean (Huxley) . 9 



11. a, Caterpillar; b, pupa; r, butterfly ... .9 



12. Spider .......... 10 



13. Crinoid or feather-star ....... 10 



14. Earthworm ....... 1 1 



15. Bladderworm stage of a Cestode (Leuckart) . . .11 



16. Sea-anemones on back of hermit-crab (Andres) ... 12 



17. Fossil Foraminifera, Nummulites . . . . .13 



1 8. Diagrammatic expression of classification in a genealogical 



tree 15 



19. Diagram of Vertebrates . . . . . . .18 



20. Diagram of Invertebrates . . . . . - . 19 



21. Diagram of cell structure (Wilson) .... 44 



22. Structure of the cell (Carnoy) ...... 46 



23. Fertilised ovum of Asian's (Boveri) ..... 47 



24. Diagram of cell division (Boveri) ..... 47 



25. Karyokinesis (Flemming) ....... 49 



26. Diagrammatic expression of alternation of generations . 57 



27. Diagram of ovum, showing diffuse yolk granules . . 59 



28. Forms of spermatozoa ....... 60 



29. Diagram of maturation and fertilisation (From "Evolution 



of Sex") 61 



30. Spermatogenesis and polar bodies (Hertwig and Weismann) 62 



31. Fertilisation in A scan's megalocephala (Boveri) ... 64 



32. Modes of segmentation ....... 66 



33. Life history of a coral, Monoxenia dwwtnii (Haeckel) . 68 



34. Embryos of bird and of man (His) ..... 7 



