54 MR. W. P. PYCRAFT ON THE [May 2, 
data to support this interpretation. But the facts, in so far as they 
are relevant to the present paper, seem to show that the primitive 
(archicentric) condition is represented fairly well in, say, Paradisea. 
In Corvus corax the longus portion is degenerate and fuses with 
the brevis just below the middle of the shaft of the humerus, the 
brevis portion then running downwards, ultimately becoming 
tendinous and passing to its Insertion at the base of the ectepi- 
Text-fig. 15. 
Dissection of arm, dorsal aspect, of Hwrylemus ochromelas, to show the deltoideus 
major longus and brevis. The longus portion has been cut through the middle, 
and the two halves drawn in opposite directions. The brevis portion has now 
become very degenerate and quite functionless. 
d.m.b., deltoideus major brevis; d.m./., deltoideus major longus; 
a., anconeus ; i., humerus: ., nervus radialis. 
condylar process. In Séwrnws both portions are extremely well 
developed, and perfectly separate until the distal end is attained, 
where they fuse in a fleshy insertion in which may be traced two 
distinct incipient tendons. 
