Illustrations de Monstrorum Historia (1642)
Click here to see the full catalogue from this bizarre illustrated guide of strangely deformed and imaginary animals and people.
Peacay just pointed out an even better collection of this book over at the University of Strasbourg. You'll find GIGANTIC scans of these bizarre beasts on their site. You'll have to do a lot of digging but try
browsing the collection through this thumbnail arrangement to find stuff faster. The works I posted above start somewhere after page 30.