Behold! The latest squished ancient bug in a book:
I guess it was a spider. Unfortunately, I've lost track of the book out of which I took the picture, but I suspect the publication date was in the 17th century. For all I know, it's an extinct species and that book holds the only sample. I'm waiting still to come across the next squashed medieval bug; I've seen them before. It's a boyish joy to find such things in books.