I've just edited a paper in which the authors have, throughout, used "Maltase cross" instead of "Maltese cross" - quite a bad error in a chemistry paper. I would not have mentioned this except that it gives me a chance to tell a favourite joke, or two:
Q: How do you make a Maltese cross? A: Give him a good slapping.
Q: How do you make a Venetian blind? A: Poke his eyes out.
Q: How do you make a cat flap? A: Throw it out of an aircraft at 30000 feet.