DESIGNATIONS FOR PLATE IV. 
I. Superior sagittal sinus of dura mater. 25. Nasal tract; choana. 
2. Lateral ventricle. 26. Palatine bone. 
3. Cerebral hemisphere. 27. Oral cavity. 
4. Pia mater. 28. Palatine nerve. 
5. Frontal bone. 29. Sphenopalatine ganglion. 
6. Cartilage of orbital wing. 30. Infraorbital vein. 
7. Mesethmoid cartilage. 31. Internal maxillary artery. 
8. Cupula posterior cartilage. 32. Maxillary nerve. 
9. Obliquus superior muscle. 33. Maxilla. 
10. Ophthalmic vessels and nerves. 34. Zygomatic bone. 
11. Levator palpebrae superioris muscle. 35. Submaxillary duct. 
12. Rectus medialis muscle. 36. Buccinator muscle. 

13. Retractor oculi muscle. 37. Masseter muscle. 
14. Rectus inferior muscle. 38. Parotid duct. 
15. Sclera. 39. Facial nerve. 
16. Retina and chorioidea. 40. External maxillary artery and _ vein 
17. Vitreous body. (anterior facial vein). 
18. Lens. 41. Platysma muscle. 
19. Posterior chamber of eye. 2. Inferior labial artery and vein. 
20. Anterior chamber. 43. Mandible. 
21. Cornea. 44. Genioglossus muscle. 
22. Ciliary body and iris. 45. Digastricus muscle. 
23. Upper eyelid. 46. Quadratus labiiinferioris muscle. 
24. Lower eyelid. 47. Geniohyoideus muscle. 
