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MR. W. K. PARKER ON THE STRUCTURE AND 
Figs. 6-9. Sections of nasal region. X 8 diameters. 
Figs. 10 & 11. Sections of orbital region. X 10 diameters. 
Figs. 12 & 13. Section of base of interorbital region and part of pterygoids. X 8 dia- 
meters. 
Fig. 14. The same, below optic nerves. X 16 diameters. 
Figs. 15-17. Horizontal sections through “sella turcica.” X 8 diameters. 
PLATE LXXXIV. 
Fourth Stage (continued). 
Figs. 1-5. Vertical sections through skull-base. X 7 & 10 diameters. 
Fifth Stage. — Head 15 lines long : Chickens 2 Days old. 
Fig. 6. Basal view of skull. X 3 diameters. 
Fig. 7. Sectional view of skull. X 3 diameters. 
Fig. 8. Side view of skull. X 3 diameters. 
Fig. 9. End view of skull. X 3 diameters. 
Fig. 10. Horizontal section of skull. X 4 diameters. 
Fig. 11. Junction of pterygoid with skull. X 16 diameters. 
Fig. 12. Part of pterygoid. X 200 diameters. 
Sixth Stage. — Chicken 3 Weeks old. 
Fig. 13. End view of skull. X 3 diameters. 
Fig. 14. Half of front view of skull. X 3 diameters. 
PLATE LXXXV. 
Seventh Stage. — Chicken 2 Months old. 
Fig. 1. Vertical section of skull. X 3 diameters. 
Fig. 2. Side view of occipital region. X 4^ diameters. 
Fig. 3. Part of the same, seen obliquely. X 6 diameters. 
Eighth Stage. — Chicken 3 Months old. 
Fig. 4. Basal view of skull. X 2 diameters. 
Fig. 5. Upper view of skull. X 2 diameters. 
Fig. 6. Lateral view of skull. X 3 diameters. 
Fig. 7. Posterior view of skull. X 2 diameters. 
Fig. 7a. Inner view of head of quadrate. X 4 diameters. 
Ninth Stage . — Fowls 7 to 9 Months old. 
Fig. 8. Horizontal section of skull, from above. X 3 diameters. 
Fig. 9. Horizontal section of skull, from below. X 2 diameters. 
