Joslyn Maxwell

Ganymedian n.	1931 ‘J. Maxwell’ Outpost on the Moon in Wonder Stories 1015/2 Ernst slowly raised his hands over his head in a gesture of peace, but the Ganymedian evidently did not understand, for it levelled the weapon.
Ganymedian adj.	1931 J‘. Maxwell’ Outpost on the Moon in Wonder Stories 1017/1 We were approaching a Ganymedian city.