FAMILY RECORD. 31 



The radiograph (fig. 41) of the left hand is not clear enough to show 

 the limits of the shortened bone, but the presence of the luxated rudi- 

 mentary phalanx in the ulnar part of the joint is clearly demonstrated. 

 On the right index there is no luxation of the shortened second phalanx. 

 It remains as a distinct phalanx with two articulation surfaces. It is 

 longer on the ulnar than on the radial side, thus giving the finger a 

 typical bend. The other finger bones are normal. 



The lengths of II 2 and IV 2 are respectively 6 and 27 mm. on the 

 right hand. On the left hand the longest diameter of the luxated 

 II 2 is 8 (?) mm., but it looks as if this diameter represents the breadth 

 and not the length of the affected phalanx. The length of IV 2 is 26 

 mm. on the left hand. 



115.6cf C. S. H., who is genetically heterozygous and shows the 

 B !-type brachyphalangy, married N. G. (b. Nov. 28, 1884) and has 

 a son 1156.1 (p. 35). 



115.79 L. H. (b. Apr. 19, 1882). She emigrated to the United 

 States, where she married J. H. (b. Feb. 15, 1873), who is unrelated to 

 her. One of us has had the opportunity of examining her hands and 

 procuring the photographs and radiographs, figs. 2 and 37. As seen 

 from these, her hands are in every respect perfectly normal. The 

 lengths of II 2 and IV 2 are respectively 24 and 29 mm. on both hands. 

 By her marriage she has 1 son; 1157.1 cf (p. 36). 



115.8cf I. H. (b. June 15, 1885). He also emigrated to the United 

 States and lives now in New York City. Photographs of his hands 

 are given in figs. 11 and 12. They show a characteristic example of 

 the B !-type of brachyphalangy. The right brachyphalangous index 

 is bent, the left one is straight. The photographs from the inside of 

 his hands show two grooves on the left index finger and only one on the 

 right. The radiographs (fig. 42) explain why this happens. The 

 malformation is seen to be strongly symmetrical in that it affects only 

 the same bone on both hands, but the shortening is more pronounced 

 in the left index. The shortened bone is somewhat longer on the ulnar 

 than on the radial side. Both shortened phalanges have two articula- 

 tion surfaces and articulate with the basal and the terminal phalanges. 

 The length of II 2 and IV 2 are respectively 6 and 29 mm. on the right, 

 10 and 29 mm. on the left hand. In this case we also have been able 

 to obtain a radiograph of the feet. It shows a marked symmetrical 

 shortening of the second phalanges of the second toes; all other bones 

 in the feet are normal. 



This man, who is genetically heterozygous for the factor for brachy- 

 phalangy, married the normal 0. M. G. K. (b. Dec. 17, 1886). They 

 have 1 son, 1158.1 cf (p. 36). 



Looking back on these children of the B!-type brachyphalangous 

 ll.Scf by his second marriage with a normal wife, we find that 2 of 

 the 6 children were unaffected, 1 showed the B-type brachyphalangy, 

 and 3 the brachyphalangy of the B !-type like their father. 



