292 OTTO L. MOHR 


entirely absent, in the third and fifth finger the shortening of the 
corresponding phalanx is very marked. In the fourth finger the 
shortening is less pronounced. But a calculation of the relation be-. 
tween the length of the second phalanx of the fourth finger and the 
length of the normal metacarpal bones proves that also this bone is 
slightly shortened. The thumbs are normal in both hands. 
The radiographs of the feet of Hans Olsen prove that his feet 
exhibit the same malformation as do the hands, only still more pro- 
nounced. The second row of phalanges is entirely absent in the toes 
from the second to the fifth and in addition the first phalanx of the 
first toe is markedly shortened (Fig. 4). 
Karen Hansen was born July 28, 1891 at Myren in Reistad. Her 
parents were Hans Fredriksen Myren and Sofie Næset. Hans Fredriksen 
Myren was born 1849 at Myren in Reistad, his wife Sofie Næset in 
1860 at Næset in Reistad. Karen Hansen has had seven brothers and 
sisters. 
The photographs and radiographs of the hands of Karen Hansen 
(Fig. 5 and 6) and the radiographs of her feet prove that her hands 
and feet are entirely normal. 
Karen Hansen’s son Ole Kristian was born Aug. 11, 1919 and he was, 
when the radiographs were taken, eight months old. The fertilizing 
coition took place while the mother was in service at Flaten in Dal, 
in which place Hans Olsen occasionally lived at that time. 
The photographs of the hands of Ole Kristian demonstrate that 
his fingers from the index to the fifth are markedly shortened. All 
these fingers, when seen from the volar surface, have two grooves in 
stead of the normal three (Fig. 7 and 8). The radiographs (Fig. 9) 
prove that the shortening is due to the fact that the second row of 
phalanges is lacking in the fingers mentioned. Only in the right ring 
finger there is seen a very small centre of ossification in the place of 
the second phalanx. The thumbs are normal. ' 
The radiographs of the feet (Fig. 10) demonstrate that the cor- 
responding toes exhibit the same malformation. In ‘addition the first 
phalanx of the first toe is absent. 
With regard to the individual last mentioned it should for the 
estimation of these data be kept in mind that his hands have not yet 
completed their development. In the normal development of hands 
and feet the second row of phalanges is the last one to complete. its 
development. Already at birth, however, these bones are normally 
well pronounced, their formation dating back to the third month of 
