154 MR. W. K. PARKER ON THE STRUCTURE OF THE BIRD'S SKULL. 



Plate XXVII. 



Fig. 1. Basis cranii of third nestling, from below, x 3 diameters. 



Fig. la. Alisphenoid of third nestling, x 3 diameters. 



Fig. 2. The same basis cranii, from above, x 3 diameters. 



Fig. 3. Side view of same, x 3 diameters. 



Fig. 4. End view of same, x 3 diameters. 



Fig. 5. Inner view of auditory region of the same, x 6 diameters. 



Fig. 6. Inner view of the other aide, x 6 diameters. 



Fig. 7. Side view of skull of fifth nestling, x If diameter. 



Fig. 8. Upper view of same, x 1 f diameter. 



Fig. 9. Lower view of same. X If diameter. 



Fig. 9a. Vomer of same, side view. X 4 diameters. 



Fig. 10. End view of same skull, x If diameter. 



Fig. 11. Part of side view of skull of the adult bird, x 6 diameters. 



