Anatomy of Acauthidositta cliloris. 



611 



Tensor pat agii brevis. — The tendon of this muscle is partly 

 embedded in the belly of the extensor metacarpi radialis 

 lonyus. 



Thigh- Muscles. 



The normal Passerine formula obtains in this genus : — 

 A . XY. 



Caud-ilio-femoralis (femoro-caudal). — This muscle is mode- 

 rately well developed : the accessory head is wanting. 



Caud-ilio-flexorius. — Both divisions of this muscle are 

 present and fairly well developed. 



The Syrinx (text-fig. 40, A, B) . 

 The syrinx of Acauthidositta is of the tracheo-bronchial 

 type, and formed apparently by a fusion of the lower rings 



Text-fig. 40. 

 A. 



B. 



A. Syrinx of Acanthidositta chloris, front view, shewing the intrinsic 



muscles and their insertion into the bronchial rings, and the form of 



the syringeal box and bronchi. 



s.t. = sterno-trachealis muscle; t.b. =tracheo-bronchialis muscle. 



B. Side view of same. 



of the trachea. The resultant tube has the inferior border 

 of its anterior aspect marked by a moderately deep notch. 



