The long list of gods was further increased in two ways. The priests sometimes made a new god by uniting two or three, or four into one, and at other times by dividing one into two or three or more. Thus out of Horus and Ra they made Horus-Ra, called by the Greeks Aroeric. Out of Osiris and Apis the bull of Memphis made of Osiris-Apis or Serapis. He carries the two sceptres of Osiris and has a bull's head.