i8o HEREDITY AND EUGENICS 



now eleven years of age. Whether they were of the 

 identical type is not stated, but they were said to 

 differ in disposition and tastes, although they are 

 stated to have had only one set of digestive and pro- 

 creative organs. The\^ both nursed the infant son, 

 and food eaten b}^ one benefited the other. As they 

 left no wills, litigation is now pending to determine 

 whether the}^ should be legally considered one or two. 



A similar case of united twins is described by 

 Sullivan (191 9). These twin bo3^s were ten ^^ears old 

 when examined, and w^ere born in Samar Island, 

 Philippines. They are identical twins in which the 

 separation has been incomplete, the right buttock of 

 one being in juncture with the left buttock of the 

 other, and the terminal part of the alimentary canal 

 is a single structure. The}^ are otherwise normal 

 and intelligent, having yellowish-brown skin colour, 

 straight black hair and dark brown eyes. But the 

 left twin is right-handed and the right twin left- 

 handed. The latter also has more rounded ears closer 

 to his head, is somewhat taller, and probably more 

 often takes the initiative. There are marked 

 differences in the proportions of the head and face, 

 both being somewhat asymmetrical and laterally 

 distorted to the right in the right twin and to the left 

 in the left twin. Hence the distortion is probably due 

 to external influences and developmental disturbances. 

 The finger prints are very similar, but with minor 

 differences in configuration. 



Danforth (191 9) has dissected the left hands of a 

 pair of poly dactyl negro infant tw^ins, and compared 

 them with a normal white infant. It is uncertain 

 whether they were identical (uniovular) twins. The 

 polydactylism consisted in a small, nearly globose, 

 mass on each hand w^ith a slender attachment to the 

 little finger. This extra digit bore a nail and friction 

 ridges. It is thought that Polydactyly of this type 



