Bizarre -- the movie can’t decide what it is. Slow-moving parlour-room drama (okay, on a boat), then weird weeds, monsters, and the Spanish Inquisition. Yeah!

 

I first saw portions on this Hammer film in a neighbor’s basement when I was a kid.

 

http://www.eccentric-cinema.com/cult_movies/lost_continent.htm
http://www.hammerfilms.com/productions/film/the-lost-continent
http://www.britishhorrorfilms.co.uk/lostcontinent.shtml
http://movies.nytimes.com/movie/review?res=9E05E0D8163AE134BC4851DFB0668383679EDE
http://mondo-esoterica.net/Lost%20Continent.html

 

Wikipedia:Lost_continent (background on the “lost continent” idea)