1891.] 



ANATOMY OF THE KAGU. 



11 



Myology. 



The account of the muscular anatomy, which I am able here to 

 offer to the Society, is very far from being complete. My material 

 (a single specimen which had been already partially dissected by 

 one of my predecesors) was not sufficient to permit of an exhaustive 

 description of the muscles. However, in the present state of our 

 knowledge of Avian myology, there are comparatively few muscles 

 which have been shown to have any classificatory importance ; con- 

 cerning most of these I have something to say. 



Fis. 1. 



Syrinx of Rkinochettis, from the side. 



At present all that is known about the muscles of Rhinochetus 

 is contained in the late Prof. Garrod's well-known paper upon bird 

 classification [19], and is therefore restricted to a statement that the 

 ambiens, femorocaudal, semitendinosus, and accessory semitendinosus 

 muscles are present. 



I. Muscles of the Fore Limb. — (1) The Tensor patagii longus 

 and the tensor patagii brevis both have a fleshy origin from the 

 clavicle ; close to the commencement of their long tendons of insertion 

 the two muscles are firmly attached to each other by fibrous tissue ; 

 near to this point, as is commonly the case, a tendinous slip from the 

 humerus joins the muscles ; and there is also a tendinous slip arising 

 from the great pectoral muscle. 



The tendon of insertion of the tensor patagii longus presents no 

 noteworthy particulars ; the tendon of insertion of the tensor brevis 

 is extremely complicated ; these tendons are connected with a thin 

 aponeurotic fascia covering some of the extensor muscles of the fore- 

 arm, and the two inner of the three branches by which the tendon 



