The skull (to kranion). Probably because it looked like a skull. See on "Mt 27:33"; see also "Mr 15:22". There they crucified him (ekei estaurwsan). There between the two robbers and on the very cross on which Barabbas, the leader of the robber band, was to have been crucified. One (on men), the other (on de). Common idiom of contrast with this old demonstrative o and men and de.