I used to watch a science fiction movie each summer back in the mid-late '60s. It was about these turtle backed looking creatures that divided and looked like brain matter in the process. They would suck the bones out of animals and were terrorizing the country (like maybe British??) I can barely remember the ending... the people were all huddles in a church and the turtles were crashing through the windows etc... when something finally caused them to die off in mid attack... I was a pretty young kid... Any one have any clues???? thanks for your help...