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"If it be granted that the Biddenden Maids were pygopagous twins, a study of the histories of other recorded cases of this monstrosity serves to demonstrate many common characters. Thus, of the 8 cases which Taruffi has collected, in 7 the twins were female; and if to these we add the sisters Rosalie and Josepha Blazek and the Maids, we have 10 cases, of which 9 were girls.
If this be so, then the teratologic difficulty is removed, for the case becomes perfectly comparable with the well-known but rare type of double terata known as the pygopagous twins, which is placed by Taruffi with that of the ischiopagous twins in the group dicephalus lecanopagus. "Pygopagous twins are fetuses united together in the region of the nates and having each its own pelvis.
CLASS IV. The next class to be considered is that in which the individuals are separate and well formed, except that the point of fusion is a common part, eliminating their individual components in this location. The pygopagous twins belong in this section. According to Bateman, twins were born in 1493 at Rome joined back to back, and survived their birth.
Again, several of the pygopagous twins, of whom there are scientific records, survived birth and lived for a number of years, and thus resembled the Biddenden terata. Helen and Judith, for instance, were twenty-three years old at death; and the North Carolina twins, although born in 1851, are still alive.
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