PASSERES 



179 



Cymbirhynchus. There is. a wide ephippial space, elongated 

 and oval in form ; the narrower parts of the tract behind 

 are two feathers wide. 



The tongue (of Cymbirhynchus) is bifid at tip and 

 elongated and cordate. 



The following are intestinal measurements of two species : 



Small int. 

 Large int. 

 Caeca 



Left liver lobe is the smallest. 



The following scheme gives the classification of the 

 Passeres according to Gaerod and Forbes : — 



Of the remaining Passeres the Mesomyodi (also sometimes 

 called Oligomyodi) are divided into two subdivisions, according 

 as to whether the chief artery of the leg is the femoral or 

 sciatic. In the Heteromeri (with the exception of Bupicola) 

 it is the femoral, in the others (Homoeomeri) the sciatic. All the 

 Mesomyodi have but one pair of muscles upon the syrinx or 

 none at all. But the name of Mesomyodi is derived from the 

 fact that these intrinsic muscles are attached to the middle 

 of the bronchial semi-ring which bears them. The Haploo- 

 plionse are those mesomyodians in which the syrinx is quite 



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