"Volto" (face) is another way of calling the Bauta, but it is not totally correct in the end.
It is also called "Larva", with the meaning of "ghost", as it gives an eerie appearance to the person wearing it, just imagine ... at night, under a full moon ... in those narrow streets ...
As we may see here, playing cards are scattered on the ground. Just to make it clear how Carnival and Gambling went together.
Volto means "face" in Italian, to show that is was the most common, simplest mask. But we have the womens' version too, that is more feminine.