412 Dr. J. Murie on the Motmots and their Affinities. 



Fig. 27. Deep or flexor surface of the same bones. 

 Fig. 28. The anterior (thumb or radial) border of the metacarpus. 

 Fig. 29. Posterior or ulnar border of same. 



Fig. 30. Upper or articular end of the left metacai-pus, twice natural size. 

 Fig. 31. Its lower digital end, also enlarged to two diameters. 

 Fig. 32. The left femur, from behind. 



Fig. 33. Right tibia (t) and fibula (/), their anterior surfaces. 

 Fig. 34. External or fibular side of the same tibia. 

 Fig. 35. Articular surface of its upper end. 

 Fig. 36. The lower articular extremity of the same. 

 Fig. 37. Tarso-metatarse of the left side, shown anteriorly. 

 Fig. 38. The inner or hallucial border of the same bone. 

 Fig. 39. The posterior aspect of the tarso-metatarse. 

 Fig. 40. Its superior articular extremity, magnified to two diameters. 

 Fig. 41. The inferior digital condyles of the tarsus, enlarged to twice the 

 natural size. 



Plate XV. 



Chiefly designed to show the characters of the feet, beak, and tongue- 

 bones of difierent genera of the Motmots. AU of exact natural proportions. 



Fig. 42. Sole of the right foot of Primiirhynchis carinatus, with its cuti- 



cular covering &c. 

 Fig. 43. The bones of the right tarso-metatarse and foot of Momotus 



{Baryphthengus) riificapillus. In this and fig. 42 the letters i, 



ii, iii, iv, respectively mark the great toe and successive digits. 

 Fig. 44. A segment of the base of the skull of Momotus {Baryphthencius) 



rufiaqnUns, to illustrate the presence of a small vomer (yo) 



lost or absent in the other forms examined : mxp, maxillo- 



palatine ; ep, anterior ethmoidal process. 

 Fig. 45. A partial view of the upper or oral surface of the lower jaw of 



the preceding species of Momotus, 

 Fig. 46. Outside of the mandibular ramus of the same bird from the 



right. 

 Fig. 47. Tongue-bones or hyoidean arch of M. rnficapillus. 

 Fig. 48. The tongue-bones of Eumomota stiperciliaris. 



In these two figures the individual osseous pieces are lettered aa 

 follows : — 



g h, glosso-hyal ; h h, basihyal ; ti h, uro-hyal ; c h, cerato-hyal, and * 

 its cartilaginous appendage ; t c, tongue-cartilages. 



Fig. 49. Beak of Momotus lessoni, in side view and from above. Drawn 

 from a specimen from Veragua. 



Fig. 50. Similar views of Hylomanes momotula. From Vera Paz. 



Fig. 51. Beak, laterally and superiorly, of Eumomota superciliaris. Spe- 

 cimen obtained at S. Pedro, Honduras. 



Fig. 52. Beak-surfaces of Prionirhytichus carinatus^ from Guatemala. 



