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Show 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 primitiv e (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 Eurylcemus ochromelas, to sliovv 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.l., deltoideus major longus; a., anconeus ; It., humerus : n., nervus radialis. condylar process. In S'turnus 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. |