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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.
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