What is "cephalonomancy"

Cephalonomancy (also known as cephaleonomancy or kephalonomancy) is an ancient form of divination which used two different methods; one was concerned with the shape of the skull, somewhat like extispicy or phrenology the other involved heating the skull of an donkey or goat while reciting various phrases, often the names of criminal suspects. If the skull crackled or the jaw moved while a name was spoken, this was taken to identify the guilty party.