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finger and a half, the median supplying the remaining fingers of both 
hands. Unfortunately no dorsal branches except those mentioned have 
been preserved. 
A very curious feature of this extremity is the evident attempt 
of the extra ulna to imitate a radius. On the front of the projection 
by the coronoid process is a surface resembling a part of the head 
of a radius and the lower end is broader than that of the ulna proper. 
Evidently the bone which developed as a supernumerary ulna made, 
so to speak, an effort to adapt itself to the functions of a radius. 
It is curious also to notice the change in the arteries from the 
normal type. Thus the brachial after a high division gave off an 
ulnar which runs deeply and gives origin to the interosseous, as is 
natural. The other branch runs at first superficially like a radial and 
then changes into an ulnar giving, as does the other, a characteristic 
deep branch to the palm. 
Still more curious is the origin from the musculo-spiral nerve 
of a branch in the place of the radial which becomes an ulnar nerve. 
We now come to the most important part of the discussion, 
namely, to the resemblance of the best described of the cases of this 
deformity to each other. It is more important than the etiology, for 
any prospect of solving that question is extremely remote, while there 
is reason to hope that this dissection will serve as a clue to some 
of the cases already described. We shall now take in turn several 
of the features of this case. The one with which it shows a very 
striking resemblance is that recently reported by JoLLy. In both the 
persons were German males and in both the deformity was on the 
left side. Dr. Jorıy’s patient was of a peculiar mental and moral 
organization. There is some (but not conclusive) reason to think that 
the same could be said of this individual. In Dr. JorLLy’s case there 
was flattening in the deltoid region an inability to raise the arm 
above a horizontal line. The scapula is peculiar in this case and 
there is indication of weakness in the same region. In both cases the 
affected arm was shorter. What can be felt about the elbow in JOLLy’s 
case agrees almost perfectly with the conditions of this one. Dr. JoLLY 
states that where the biceps should be there is felt a strong bony 
ridge ending in a blunt prominence. This is the supernumerary 
internal condyle which may have had a stronger development than 
in this case. It is perhaps not impossible that the strong muscular 
or tendinous band running to it may have given the impression that 
the bone extended higher than was really the case. The restriction 
of angular motion and the almost complete absence of pronation and 
