FWIW...that is the first paper negative I've ever scanned. Most of the time I'm printing them on the same paper I shot them on.
Here is a post on my blog that shows a bunch of work my junior students did last term. You'll be able to tell the 4x5 and 8x10 paper negs from the 6x6cm film shots one student did.
Student's Paper Negatives
The question is, as PE suggests...does anyone want to develop a Zone System for paper negatives?