I did not look at the guide, but from what I found when researching last year, you need a microscope and a micrometer to measure the ovum. The naked eye is very un reliable for telling fertility. Heck, there are some that claim they can tell if an egg is going to hatch out a pullet or a cockerel! They will be correct 50% of the time usually.Jill, after looking at the examples, I think you might have fertile eggs (not an expert here). It does look like a "bulls eye" around the center. You could always pop one of them in the incubator to test it out. There is a thread somewhere on BYC about a chicken/guinea cross hatching. Read it a few years ago.
Put the eggs in the incubator and if there are no veins in 5 days it is not fertile. That is the real test of fertility....