 In 1895 , surgeon J. W. Ballantyne considered the case of the Biddenden Maids from a teratological perspective . He suggested that they had in fact been pygopagus ( twins joined at the pelvis ) . Pygopagus twins are known to put their arms around each other 's shoulders when walking , and Ballantyne suggested that this accounted for their apparently being joined at the shoulders in drawings . The pygopagus Millie and Christine McCoy had lived in Britain for a short time before going on to a successful singing career in the United States , and it was known from their case that such twins were capable of surviving to adulthood . 
 In 1895 , surgeon J. W. Ballantyne considered the case of the Biddenden Maids from a teratological perspective . He suggested that they had in fact been pygopagus ( twins joined at the pelvis ) . Pygopagus twins are known to put their arms around each other <a href='null_genetive' title='1'><mark>'s</mark></a>shoulders when walking , and Ballantyne suggested that this accounted for their apparently being joined at the shoulders in drawings . The pygopagus Millie and Christine McCoy <a href='been_done' title='2'><mark>had</mark></a> lived in Britain for a short time before going on to a successful singing career in the United States , and it was known from their case that such twins <a href='uninflect' title='3'><mark>were</mark></a> capable of surviving to adulthood . 
In 1895 , surgeon J. W. Ballantyne considered the case of the Biddenden Maids from a teratological perspective . He suggested that they had in fact been pygopagus ( twins joined at da pelvis ) . Pygopagus twins r known to put their arms around each other  shoulders when walkin , and Ballantyne suggested that this accounted fa their apparently being joined at tdashoulders in drawings . The pygopagus Millie and Christine McCoy done lived in Britain ffaa short time before going on to a successful singin career in thdanited States , and it was known from their case that such twins was capable of surviving to adulthood .