1905.] 



ANATOMY OF LIMICOLINE BIRDS. 



161 



of the humeral head. This has already been noted by Fiirbringei' 

 and Beddard (1 and 2), and the latter author states that he found 

 a similar reduction in Rhynchoea. In the example of Rhynchma 

 that I dissected, however, I found a very different condition, the 

 well-marked occLirrence of a peculiar Limicoline deviation which 

 occurs in a more or less modified form in all the other birds which 

 form the subject of this paper. 



The Limicoline peculiarity of the biceps brachialis is well 

 marked in Chionis (see text-fig. 27). The main mass of the 



Text-fig, 27. 



BiV 



Biceps of Chionis alba. 



AC. Coracoid head. BI.P. Biceps patagialis. BI. 1. Chief portion of biceps. 

 BI. 2, Accessory biceps. R. Radial insertion. U. Ulnar insertions. 



muscle arises by a tendon from the acrocoracoid (AC.) and by a 

 large and fleshy head from the humerus (BI. 1) ; this tapers 

 towards the lower end of the humerus and then divides into a 

 Proc. Zool. Soc— 1905, Vol. II. No. XI. 11 



