610 Mr. W. P. Pycraft on the 



hut narrow band, in place of the more usual triangular 

 form. 



Pectoralis abdominalis. — This muscle was barely traceable. 



Deltoideus major (text-fig. 39) . — This muscle is peculiar in 

 that in the splitting-up into brevis and major portions a part 

 of the brevis portion arising from the os humero-scapulare has 

 become cut off to form the principal part of the belly of the 

 longus portion. As a result, there is a strong tendency 

 towards the separation of this mass to form two muscles 



/ 



d.m 6 



Text-fig. 39. 

 a.C 



Dissection of the left wing of Acanthidositta c/iloris, to show the 

 deltoides major el minor. 



inserted by a common tendon into the usual tubercle above 

 the radial condyle. A very little further splitting would 

 divide the muscle into three distinct portions, one inserted 

 into the deltoid crest, and the other two into the tubercle of 

 the radial condyle of the humerus. The highly specialised 

 condition of these muscles shown by Acanthidositta I have 

 not met with elsewhere. 



Pectoralis propatagialis brevis. — This is represented by 

 a slender tendon inserted into the tensor patagii brevis just 

 before it passes into the characteristic tendon. 



