Watching this film Mark Of The Gorilla I was hearkening back to Johnny Weissmuller playing Tarzan in Tarzan Triumphs which was made during World War II. In that one the Nazis invade a hermit jungle city and Tarzan deals with them in his usual fashion. Some of them must have buried some loot because that's what this film deals with.
It's hidden on what is now a government game preserve and people who get too close get dealt with by a couple of guys in gorilla suits. As gorillas are not known to inhabit the area, that gets Jungle Jim immediately suspicious.
Onslow Stevens is the chief villain here, he wants to get the loot and get it out of there without the authorities or anyone else interfering. He sets more traps for Johnny Weissmuller than you would find in your average movie serial.
Two women are in the cast and in danger from the 'gorillas' as well, Trudy Marshall niece of game warden Selmar Jackson and mysterious foreign lady Suzanne Dalbert who is also looking for the Nazi loot.
By now the Jungle Jim series was dealing strictly with the kiddie trade and it shows.