Bacchic heads? Suggests What? Help!

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I am trying to do a reconstruction of the Sertorius Festus Phalerae and one description mentions "Bacchic heads".

Does anyone know what "Bacchic heads" implies?

I know Bacchus, but Bacchic heads? Is this suggesting more than one head of Bacchus (Bacchic plural for Bacchus) or like the gorgons where there are three different ones?

Any information or pics are appreciated.


Thanks


Paolo

[LUCIUS ALFENUS AVITIANUS]

In the context, sugest a head with a hairstyle like Bacus. It's a head wearing some vine leaf crown.