Dr. J. Murie on the Motmots and their Affinities. 391 



had not theu the Motmots at my command^ and quoted Eylon^s 



measurements. I since find the ulnar length he gives o£ M. 

 brasiliensis questionable, and in this place, as appropriate, rectify 

 chance of error in false data and conclusions. 



{Baryphthengu3) Eumomofa 



ruficapillus. aupereiliarw. 



Ulna to Inimerus 126 : 100 126 : 100 



Metacai-pus to humerus 50 : 100 48 : 100 



Mid digit to liumerus 35 : 100 • 37 : 100 



Tibia to Femur 162 : 100 162 : 100 



Tarso-metatarse to femur 100 : 100 100 : 100 



Mid anterior toe to femur 91 : 100 100 : 100 



Humerus to wing 32:100 32:100 



Ulna to wing 40 : 100 40 : 100 



Metacarpus to -wing 16 : 100 15 : 100 



Mid digit to wing 11 : 100 12 ? : 100 



Femur to leg 22 : 100 21 : 100 



Tibia to leg 35 : 100 36 : 100 



Tarso-metatarse to leg 22 : 100 21 : 100 



Anterior mid toe to leg 21 : 100 21 : 100 



Femur to humerus 70 : 100 59 : 100 



Tibia to ulna 90:100 59:100 



Tarso-metarse to metacarpus 141 : 100 123 : 100 



Mid. ant. toe to mid. dig. of wing .... 183 : 100 160 : 100 



Leg to wing 103 : 100 89 : 100 



The tongue-bone of birds is usually developed or built up by 

 three centre-pieces in a line, and a pair of retro-current styli- 

 form forks, containing each two or three segments. Altogether 

 they compose the hyoid arch, or are equivalent {ceteris paribus) ' 

 to the branchial arches of fish. In the adult M. ruficapillus the 

 three median elements are soldered together — the fore part (glos- 

 sohyal) being stoutish and truncate, the middle (basihyal) later- 

 ally indented with facets for the articulation of the side- pieces, 

 and the posterior (urohyal) flatter and spatulate. The anterior 

 segments of the side-rods (cerato-hyals) are bony, the smaller 

 tendors piece behind cartilaginous. It is the latter which con- 



