A while back Karl Shuker posted a blog entry that repeated the story about a tiny human mummy uncovered at Casper, Wyoming that was supposed to have been an adult when it died because it had a full set of adult teeth. That is the standard story on the books but it is false.
I wrote to Karl that the mummy had been the subject of an article in Persuit of which he was unaware. And it was not the mummy of an adult but a deformed foetus that very likely had never drawn breath. I mentioned that I had seen the X-rays of it as well. And so here is the illustration.
The first giveaway is that the poor creature had no brains to speak of; mostly an empty braincase (the X-ray seems to show packed dirt in that area.) And it did not have adult teeth, it had baby teeth: most of what shows in its mouth are the unemerged tooth buds. Basically all it is is a very grisly relic, but certainly not evidence of a whole race of such things running around alive at one time.