[Illustration: FIG. 11. Cross section of skull of Mourning Dove;
anterior view. x 2-1/2.
FIG. 12. Dorsal view of right quadrate of Mourning Dove showing
movement which protracts the upper mandible (broken line). x 5.]
[Illustration: FIG. 13. Right lateral view of the jaw musculature of
the White-winged Dove; superficial layer, x 5.
FIG. 14. Right lateral view of the jaw musculature of the Mourning
Dove; superficial layer. x 5.]
[Illustration: FIG. 15. Dorsal view of the jaw musculature of the
White-winged Dove (right side); superficial layer. x 5.
FIG. 16. Dorsal view of the jaw musculature of the Mourning Dove
(right side); superficial layer. x 5.]
[Illustration: FIG. 17. Dorsal view of the jaw musculature of the
White-winged Dove (right side); middle layer. x 5.
FIG. 18. Dorsal view of the jaw musculature of the Mourning Dove
(right side); middle layer. x 5.]
[Illustration: FIG. 19. Dorsal view of the jaw musculature of the
White-winged Dove (right side); deep layer. x 5.
FIG. 20. Dorsal view of the jaw musculature of the Morning Dove (right
side); deep layer. x 5.]
[Illustration: FIG. 21. Ventral view of the jaw musculature of the
White-winged Dove (_M. depressor mandibulae_ not shown). x 5.
FIG. 22. Ventral view of the jaw musculature of the Mourning Dove
(_M. depressor mandibulae_ not shown). x 5.]