DEVELOPMENT OF TKE SKULL IN THE PIG. 



335 



Fig. 8. 8th section of same. X 7^ diameters. 



Fig. 8". Mandibular portion of same section. X 7^ diameters. 



Fig. 9. 9th section of nasal region. X 7^ diameters. 



Fig. 10. 10th section of same. X 7| diameters. 



Fig. 11. 11th section of same. X 'i^ diameters. 



Fig. 12. 12th section of same. X 7| diameters. 



Fig. 13. 13th section of same, head. X 7-^ diameters. 



Fig. 14. 14th section of same, head. X 7^ diameters. 



Fig. 14". Part of fig. 14. x 14 diameters. 



PLATE XXXII. 

 Third Stage (continued). 



Fig. 1. 15th section of same, head, x 7 diameters. 



Fig. 2. 16th section of same, head. X 7 diameters. 



Fig. 3. 17th section of same, head. X 7 diameters. 



Fig. 4. 18th section of same, head, x 7 diameters. 



Fig. 5. 19th section of same (part back view). X 14 diameters. 



Fig. 6. 20th section of same, head (back view). X 10 diameters. 



Fig. 7. 21st section of same (part back view). X 14 diameters. 



Fig. 8. 21st part of section (front view), x 14 diameters. 



Fig. 9. Hinder part of a section taken liorizontally through the nasal region (front view) 

 X 10 diameters. 



Fig. 10. A similar section of same taken further backwards and lower down (back view) 

 X 10 diameters. 



PLATE XXXIIL 

 Third Stage (continued). 



Fig. 1. 22nd section of the same head (part seen from the front). X 14 diameters. 

 Fig. 2. Vertical section of head, x 5 diameters. 



Fig. 3. The same, with brain and septum nasi removed. X 5 diameters. 



Fourth Stage, — Embryo Pig, 2-| inches long. 

 Fig. 4. Vertically transverse section through fore part of brain. X 5 diameters. 

 Fig. 5. A similar section through fore part of orbit (part), x 5 diameters. 

 Fig. 6. A like section through hind part of orbit (part), x 5 diameters. 

 Fig. 7. A similar section througli sphenoid (part). X 5 diameters. 

 Fig. 8. Part of same section (right side). X 14 diameters. 

 Fig. 9. A similar section through the fore part of auditory sac. X 7 diameters. 

 Fig. 10. Another section through hinder part of same. X 14 diameters. 



Fifth Stage. — Embryo Pig, 3 inches long. 

 Fig. 11. Section through posterior sphenoid. X 3^ diameters. 



