This cache actually has nothing to do with earthworms, nor does it have anything to do with anyone named Ernie, unless of course, some guy named "Ernie" happens to find it. I just thought it sounded like a fun name for a cache. And this one needs a fun name to keep you from cursing while you keep on looking for it. Experienced geocachers will certainly have an advantage in finding this one. Good luck!
*Note: I am not including hints for any of the caches in the series, but if you want to drop me a note, I am happy to steer you in the right direction.