What is "skull-face"

Skull-Face is a story written by Robert E. Howard, which appeared as a serial in Weird Tales magazine, beginning in October 1929, and ending in December, 1929. The story stars a character called Steve Costigan but this is not Howard's recurring character, Sailor Steve Costigan. The story is clearly influenced by Sax Rohmer's opus Fu Manchu but substitutes the main Asian villain with a resuscitated Atlantean necromancer (very similar to Kull arch-foe Thulsa Doom) sitting at the center of a web of crime and intrigue meant to end White/Western world domination with the help of Asian/semite/African peoples and to re-instate surviving Atlanteans (said to lie dormant in submerged sarcophagi) as the new ruling elite.