The rare males have sub-spherical frontal knobs, with spines and mechanoreceptor on surfaces.In the basal part of penis, the rare males have evident spine-like outgrowths.
The tassel that graduates transfer from one side of the cap to the other as a sign of their elevation is an outgrowth of the medieval biretta worn by Roman Catholic clergy.
It never became firmly established here as a folk custom, however, and today's elaborate New Year's parade in Philadelphia is the only organized outgrowth of English mumming in the United States.