392 



JAMES CRAWFORD WATT 



its length. Beyond the radius is a considerable clear interval 

 including all the carpal and metacarpal region where there is 

 yet no ossification, but in the single digit a small rectangular 

 ossification is seen proximally and another occurs distally, these 

 representing the shafts of the proximal and distal phalanges. 

 Between the two is a clear space where the still unossified car- 

 tilage of the middle phalanx lies. 



The right arm (text fig. B) presents a few differences from the 

 left. The scapula and humerus are both typical. The humerus 

 does not, however, reach as near the point of the elbow as does 



Proxnnal phalanx 



Distal phalanx 



la.nx 



Text fig. A Sketch from a radiograph of the left arm showing the ossified 

 portions of the skeleton. 



Text fig. B Sketch from a radiograph of the right arm showing the ossified 

 portions of the skeleton. Note the extra digit at the elbow. 



that of the left arm, the end of the radius lying under it instead 

 of in front of it. The radius is more curved than in the left 

 arm. No carpal bones yet appear, but in the metacarpal region 

 there is a small ossification representing the shaft of a single 

 bone. As on the left side ossifications for the proximal and 

 distal phalanges are present in the digit, while no middle pha- 

 lanx yet shows. The proximal phalanx is not as well developed 

 as on the left side. 



The appendage at the elbow on the right limb (text fig. B) is 

 interesting. Its pedicle appears in the interval between the 

 humerus and radius and running dorsally in its broad part 



