Dr. J. Mui'ie on the Motmots and their Affinities. 411 



DESCRIPTION OF PLATES. 



Plate XIII. 



Illustrations of the bones of the cranium and shoulder-girdle of Momotu$ 

 lessoni, of the natural dimensions. 



Fig. 1. The inferior or palatal sm-face of the skull: w a:^, maxillo-palatine. 

 Fig. 2. Upper cranial view : n, nostril or anterior nares, partially divided 



by a septum. 

 Fig. 3. The light quadrate bone, seen from the inside. 

 Fig. 4. The inferior articular knuckles of the same. The letters to this 



and the preceding figure are : — 

 1, orbital limb ; i, internal, e, external, and p, posterior knuckle 



for articidation with the lower jaw. 



Fig. 5. Occipital facies of the skidl : pf, postfrontal process. 



Fig. 6. A profile view of the cranium without the mandible : /, fissure or 

 cleft between the ethmoid and maxillary segments ; e/), eth- 

 moidal process ; fp, prefrontal process ; z, zygomatic process. 



Fig. 7. Sternum and shoulder-girdle, from the side. 



Fig. 8. The same, on its inferior surface. 



Fig. 9. Partial view of the inside of the sternum, to show r c, rostral ca- 

 vity or excavation. 



Fig. 10. The head and tongue of Momotus swainsoni {Prionites baha- 

 niensis, Swain.), after Sir W. Jardine : t, tongue. 



Plate XIV. 



The skeleton oi Eumomota superdliaris. Excepting figs, 30, 31, 40, 

 and 41, aU are drawn to natural scale. 



Fig. 11. The pelvis, its interior surface. •• 



Fig. 12. Dorsal aspect of the pelvis. 



Fig. 13. A lateral view of the pelvis. 



Fig. 14. Lower or pectoral surface of the sternum. 



Fig. 15. The sternum in profile. 



Fig. 16. A side view of the skull. 



Fig. 17. The mandible, also seen laterally. 



Fig. 18. Upper surface of the skuU. 



Fig. 19. Its inferior or basal aspect. 



Fig. 20. Superior or oral superficies of the lower jaw. 



Fig. 21. The right humerus, its posterior surface. 



Fig. 22. Its upper articular end. 



Fig. 23. Its lower articular end. 



Fig. 24. The ulna and radius of the right side, fore and slightly outer 



view. 

 Fig. 25. Lower articular end of the same ulna. 



Fig. 26. The metacarpal bones of the left wing, outer or exterior surface. 



2 o 2 



