Schultz: Zygodactyly 



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THREE GENERATIONS OF ZYGODACTYL TOES 



The inheritance of zygodactyly between the second and third toes on both sides for three 

 generations. In this family the character is more likely to be inherited by men than by women. 

 Redrawn from Pfitzner.° (Fig. 11.) 



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THE INHERITANCE OF ZYGODACTYLY BETWEEN THREE TOES 



The first, second, and third toes on both feet are united by webs. Webbing between the 

 fingers is frequently associated with webbed toes, and is a character that should be looked for in 

 future investigations of zygodactyly. Redrawn from Wolff. ^ (Fig. 12.) 



small remnants at the base of the toes. 

 If this reduction does not take place, as 

 in the few individuals with webbed toes 

 recorded in the literature, it must be 

 classed as a local developmental arrest. 

 The term "syndactyly" or "syndac- 

 tylism" is commonly applied to this 

 condition of webbed toes or fingers; 

 however, the same name is given as well 

 to the union of the bony elements of 

 foot or hand and sometimes to the par- 



tial or complete lack of toes or fingers 

 ("split-foot," etc.). These last men- 

 tioned anomalies are not an arrest in 

 otherwise normal development, but are 

 due to various deep developmental 

 disturbances and are therefore geneti- 

 cally different from the condition 

 described in this paper. Weidenreich,^ 

 in a recent paper, proposes to call the 

 condition of webbed toes or fingers 

 zygodactyly to distinguish it from all 



^ Weidenreich, F. 1921. 

 pp. 51-282. 



Der Menschenfuss. Zeitschr. f. Morphol. u. Anthrop., vol. XXII, 



