Update 8/2//2014: there is a complete version incl. images at http://archive.is/XwhgQ
First, via Biomediale. Contemporary Society and Genomic Culture, a paper on chimaera phylogeny by Sven Drühl I found the unidentified print above. Searching some more, The Cabinet of the Solar Plexus says that it is by Hendrick Goltzius.
End of quest.
Two other favourites from that series include a grotesque holding a club spurning another grotesque and two footed phalli stabbing each other while surrounded by two grotesque drooping masks that resemble an elongated scrotum, that last a real find for the metamorphic genitalia category.