34 A NEW TYPE OF BRACHYPHALANGY IN MAN. 



FIFTH FAMILY OF V GENERATION. 



The normal 115.3 cf P. F. G. H. had, by his marriage with J. G., 

 3 children, 1153.1-1153.3. 



1153.1 rf 1 P. F. H. (b. Mar. 21, 1905). Photographs and radio- 

 graphs of his hands prove that he is free from brachyphalangy. Lengths 

 of II 2 and IV 2 on both hands are 21 and 25 mm., respectively. 



1153.2 9 S. E. H. (b. Mar. 12, 1907). Photographs and radio- 

 graphs of her hands show that she is normal. Lengths of II 2 and 

 IV 2 are on both hands 18 and 20 mm., respectively. 



1153.3 9 E. R. H. (b. Jan. 1, 1910). Photographs and radiographs 

 of her hands prove that she is free from brachyphalangy. Lengths of 

 II 2 and IV 2 on both hands 18 and 21 mm., respectively. 



All the children of this family have perfectly normal hands, which 

 was to be expected from the examination of their father. 



SIXTH FAMILY OF V GENERATION. 



The B !-type brachyphalangous 115.4 cf M. H. has, by his marriage 

 with the normal H. G., 1 daughter, 1154.1 9 . 



1154.1 9 I. S. H. (b. May 9, 1905). A photograph of her hands 

 (fig. 15) shows a typical case of symmetrical brachyphalangy of the 

 indices. The radiographs (fig. 44) demonstrate that all the other 

 finger bones are normal and give a good idea of how the brachypha- 

 langous condition of the indices is brought about. While all the other 

 bones of the hand still have their epiphysial cartilages, those of the 

 second phalanges of the second fingers are already ossified, though the 

 girl was only 12 years old when the plates were taken. This fact 

 indicates that this case is to be regarded as belonging to the B !-type 

 of brachyphalangy. While all the other phalanges keep on growing, 

 the second ones of the indices remain short. This makes the difference 

 between the lengths of II 2 and IV 2 far less striking than it will be 

 in the adult individual. 



The actual lengths of II 2 and IV 2 in this case are 8 and 23 mm. 

 respectively on the right hand, 10 and 23 mm. on the left hand. It 

 will be noticed that the shortened phalanx of the right hand is markedly 

 thicker than that of the left. 



Genetically this individual is heterozygous for the factor for brachy- 

 phalangy. 



SEVENTH FAMILY OF V GENERATION. 



The B-type brachyphalangous 115.5 cT H. M. H. has, by his mar- 

 riage with the normal D. K., 3 children, 1155.1-1155.2, a and 6, the 

 two latter identical twins. 



1155.1 9 (b. Mar. 26, 1913) died the day of birth. Parturition 

 was complicated and the child had to be mutilated. Her father states 

 that nothing is known regarding her hands. 



