Polymastia

Viewed in the light of comparative anatomy, polymastia is interesting, as showing a tendency to re-establish the series of mammae seen in other mammalia; but Darwin has lately repudiated atavism as a cause of this malformation

The warts on its skin, you see, remind one of the extra nipples which every she-witch was supposed to have and that goes back (am I boring you, dear boy? How is your glass?) that goes back to the polymastia or superfluity of breasts of the ancients.