LIST OF ILLUSTRATIONS. 



Frontispiece (Colored). Head of Adult Male Mandril. 



Figure 1. Skull of a Hornless Sheep 23 



Figure 2. Skull of a Dog . . 23 



Figure 3. Diagram Showing Relative Size of the Cornea to the 



Eyeball in Different Mammals . 25 



Figure 4. Sections through the Iris of a Horse . ... 29 



Figure 5. Front of a Horse's Eye from which the Cornea has 



been Removed to Expose the Iris with the "Corpus Nigrum" 30 



Figure 6. Sperm Whale . . . 33 



Figure 7. Diagram to Show Hypothetical Semi-decussation of 



Macular Nerve Fibers at the Chiasma 37 



Figure 8. Headlight Fish. ^Ethoprora Lucida 47 



Figure 9. Ciliary Body of the Echidna 58 



Figure 10. Ciliary Body of the Great Ant-eater .... 59 



Figure 11. Ciliary Body of the Rabbit . 60 



Figure 12. Ciliary Body of the Wallaby . 60 



Figure 13. Ciliary Body of the Ox ... 61 



Figure 14. Ciliary Body of the Cat . 61 



Figure 15. Ciliary Body of the Rhesus Monkey 62 



Figure 16. Ciliary Body of the Chimpanzee 63 



Figure 17. Ciliary Body of the Human Eye 63 



Figure 18. Varieties of the Ciliary Muscle in the Human Eye . 68 

 Figure 19. Diagram to Show the Relative Size of the Lens in 



Different Species of Mammals .... .... 71 



Figure 20. Diagram to Show the Size of the Lens of the Human 



Lens at Different Times in Fetal Life 73 



Figure 21. Diagram to Show Relation of Ciliary Body to the 



Side of the Lens at Different Times in Fetal Life .... 75 



Figure 22. Eye of an Antelope Showing the Retractor Bulbi or 



Choanoid Muscle 96 



Figure 23. Section Through Gegenbauer's Muscle from the Inner 



Surface of the Cornea of a Sheep 96 



Figure 24. Drawings Showing the Arrangement of Parts at the 



Inner Canthus in Different Mammals 104 



Figure 25. Section Showing Lining Membrane of the Suborbital 



Pit of a Sheep 105 



